ERROR: Unexpected HTTP Status code: 500 Server Error (url = http://localhost:54321/3/Parse)

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rbp...@scu.edu

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Mar 7, 2016, 7:38:11 PM3/7/16
to H2O Open Source Scalable Machine Learning - h2ostream
Hi,

I am seeing the error below when trying to import data table from R to H2o after uninstalling and reinstalling h2o. Current h2o package version is 3.6.0.8. Any help will be appreciated.

#Information about newdata1
> class(newdata1)
[1] "data.table" "data.frame"

> sapply(newdata1,class)
tag citation expmm expyy make state location violCode Description
"factor" "integer" "factor" "integer" "factor" "factor" "factor" "integer" "factor"
violFine balance penaltyDate openFine openPenalty noticeDate ImportDate frequency violHours
"numeric" "numeric" "logical" "numeric" "numeric" "factor" "factor" "integer" "character"
violDates address lubhour
"factor" "character" "integer"

#Error
> pv.hex <- as.h2o(newdata1, destination_frame = "pv.hex")
ERROR: Unexpected HTTP Status code: 500 Server Error (url = http://localhost:54321/3/Parse)

java.lang.RuntimeException
[1] "water.MRTask.getResult(MRTask.java:505)"
[2] "water.MRTask.doAll(MRTask.java:379)"
[3] "water.MRTask.doAll(MRTask.java:366)"
[4] "water.MRTask.doAll(MRTask.java:365)"
[5] "water.parser.ParseDataset.parseAllKeys(ParseDataset.java:264)"
[6] "water.parser.ParseDataset.access$000(ParseDataset.java:30)"
[7] "water.parser.ParseDataset$ParserFJTask.compute2(ParseDataset.java:149)"
[8] "water.H2O$H2OCountedCompleter.compute(H2O.java:1069)"
[9] "jsr166y.CountedCompleter.exec(CountedCompleter.java:468)"
[10] "jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:263)"
[11] "jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:974)"
[12] "jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1477)"
[13] "jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)"

Error in .h2o.doSafeREST(h2oRestApiVersion = h2oRestApiVersion, urlSuffix = page, :
water.DException$DistributedException: from /127.0.0.1:54321; by class water.parser.ParseDataset$UpdateCategoricalChunksTask; class java.lang.NullPointerException: null

Thanks,
Ritesh

avniw...@gmail.com

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Mar 18, 2016, 6:51:24 PM3/18/16
to H2O Open Source Scalable Machine Learning - h2ostream, rbp...@scu.edu
Hi Ritesh,

I was not able to recreate your problem. Could you please send me the logs (you can download them in R using the command h2o.downloadAllLogs())?

Thanks,
Avni

jpk...@gmail.com

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May 3, 2016, 2:47:04 PM5/3/16
to H2O Open Source Scalable Machine Learning - h2ostream, rbp...@scu.edu, avniw...@gmail.com
I'm having what seems to be a very similar problem, trying to get data into R. The h2o version is 3.8.2.3, Java (via the JDK, is: 1.7.0_79-b15. The people seem to have no difficulty getting this to run on their machines:

Any help would be much appreciated.

ERROR MESSAGE:

> market_data <- h2o.uploadFile(filePath, destination_frame = "",parse = T,header = T, sep = ",", na.strings = c("unknown"),progressBar = FALSE, parse_type = "CSV")

ERROR: Unexpected HTTP Status code: 500 Server Error (url = http://localhost:54321/3/Parse)

water.DException.DistributedException
[1] "water.parser.FVecParseWriter.setIsAllASCII(FVecParseWriter.java:143)"
[2] "water.parser.CsvParser.parseChunk(CsvParser.java:131)"
[3] "water.parser.ParseDataset$MultiFileParseTask$DistributedParse.map(ParseDataset.java:868)"
[4] "water.MRTask.compute2(MRTask.java:612)"
[5] "water.H2O$H2OCountedCompleter.compute1(H2O.java:1093)"
[6] "water.parser.ParseDataset$MultiFileParseTask$DistributedParse$Icer.compute1(ParseDataset$MultiFileParseTask$DistributedParse$Icer.java)"
[7] "water.H2O$H2OCountedCompleter.compute(H2O.java:1089)"
[8] "jsr166y.CountedCompleter.exec(CountedCompleter.java:468)"
[9] "jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:263)"
[10] "jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:974)"
[11] "jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1477)"
[12] "jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)"
Hi,

Error in .h2o.doSafeREST(h2oRestApiVersion = h2oRestApiVersion, urlSuffix = page, :

ERROR MESSAGE:

from /127.0.0.1:54321; by class water.parser.ParseDataset$MultiFileParseTask; class java.lang.ArrayIndexOutOfBoundsException: 1

Lauren DiPerna

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May 3, 2016, 3:38:43 PM5/3/16
to jpk...@gmail.com, H2O Open Source Scalable Machine Learning - h2ostream, rbp...@scu.edu, avniw...@gmail.com
Are you able to run the following successfully in R?

library(h2o)
h2o.init()
irisPath = system.file("extdata", "iris.csv", package="h2o")
iris_data <- h2o.uploadFile(irisPath, destination_frame = "",parse = T,header = T, sep = ",", na.strings = c("unknown"),progressBar = FALSE, parse_type = "CSV")


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jpk...@gmail.com

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May 3, 2016, 5:07:02 PM5/3/16
to H2O Open Source Scalable Machine Learning - h2ostream, jpk...@gmail.com, rbp...@scu.edu, avniw...@gmail.com
Lauren,

Yes, that all works as it should and I get the progress bar and can see the data.

John

j...@qed.ai

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May 23, 2016, 5:56:44 PM5/23/16
to H2O Open Source Scalable Machine Learning - h2ostream, jpk...@gmail.com, rbp...@scu.edu, avniw...@gmail.com
Hi,

I also had the same error:

ERROR: Unexpected HTTP Status code: 500 Server Error

Any explanation for that?

Lauren DiPerna

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May 23, 2016, 8:00:43 PM5/23/16
to j...@qed.ai, H2O Open Source Scalable Machine Learning - h2ostream, John Kaye, Ritesh Patel, Avni Wadhwa
can you provide the code you had that produced the error and the stack trace, or was the error produced after running:

library(h2o)
h2o.init()
irisPath = system.file("extdata", "iris.csv", package="h2o")
 iris_data <- h2o.uploadFile(irisPath, destination_frame = "",parse = T,header = T, sep = ",", na.strings = c("unknown"),progressBar = FALSE, parse_type = "CSV")

Jiehua Chen

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May 24, 2016, 1:26:34 AM5/24/16
to Lauren DiPerna, Jiehua Chen, H2O Open Source Scalable Machine Learning - h2ostream, John Kaye, Ritesh Patel, Avni Wadhwa
I think it happened when the dataframe's number of rows is larger than the number of columns. At least for my case.

---
Jiehua Chen, Ph.D.
QED | http://qed.ai

Lauren DiPerna

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May 24, 2016, 12:59:40 PM5/24/16
to Jiehua Chen, H2O Open Source Scalable Machine Learning - h2ostream, John Kaye, Ritesh Patel, Avni Wadhwa
Did it get resolved? could you provide your log files or code snippet if it's still an issue?

Lauren DiPerna

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May 31, 2016, 8:27:17 PM5/31/16
to Jiehua Chen, H2O Open Source Scalable Machine Learning - h2ostream, John Kaye, Ritesh Patel, Avni Wadhwa
Hi Jiehua,

I wasn't able to replicate your issue (I also tried removing most of the columns so that rows >> columns, but it still worked):

> filePath <- "/Users/laurend/Downloads/testdata.csv"

> data <- h2o.uploadFile(filePath, destination_frame = "",parse = T,header = T, sep = ",", na.strings = c("unknown"),progressBar = FALSE, parse_type = "CSV")
  |=========================================================================================================| 100%

when you change filePath for the location of your testdata.csv, the above should hopefully run.

cheers,

Laurn

On Mon, May 30, 2016 at 6:40 AM, Jiehua Chen <j...@qed.ai> wrote:
Hi,

Attached is the data.

---
Jiehua Chen, Ph.D.
QED | http://qed.ai

parindsh...@mail.jugnoo.in

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Jun 6, 2016, 8:59:48 AM6/6/16
to H2O Open Source Scalable Machine Learning - h2ostream, jpk...@gmail.com, rbp...@scu.edu, avniw...@gmail.com
i also have similar issue, but the command given above is also giving me same error which is get using as.h2o

i got below error by running your provided command. please help
ERROR: Unexpected HTTP Status code: 500 Server Error (url = http://localhost:54321/3/PostFile?destination_frame=%2FUsers%2Fparindsheel%2FLibrary%2FR%2F3.3%2Flibrary%2Fh2o%2Fextdata%2Firis.csv_sid_99f6_5)

Error: lexical error: invalid char in json text.
<html> <head> <meta http-equiv=
(right here) ------^

Erin LeDell

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Jun 18, 2016, 3:12:52 PM6/18/16
to parindsh...@mail.jugnoo.in, H2O Open Source Scalable Machine Learning - h2ostream, jpk...@gmail.com, rbp...@scu.edu, avniw...@gmail.com
Can you provide a reproducible example and let us know what version of
H2O you are running? It looks like you are just using iris, so it
should be easy to reproduce.
--
Erin LeDell Ph.D.
Statistician & Machine Learning Scientist | H2O.ai

Aschyle

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Jun 30, 2016, 5:52:59 AM6/30/16
to H2O Open Source Scalable Machine Learning - h2ostream, parindsh...@mail.jugnoo.in, jpk...@gmail.com, rbp...@scu.edu, avniw...@gmail.com
Hi,

I'm having the same problem loading a previously saved model: the following  
gbm <- h2o.loadModel("./models/GBM_model_R_1462269640231_2")

fails with the error message ERROR: Unexpected HTTP Status code: 500 Server Error (url = http://localhost:54321/99/Models.bin/)

Error: lexical error: invalid char in json text.
                                       <html> <head> <meta http-equiv=
                     (right here) ------^

I'm certain the models were built with the same h2o version I'm using i.e. 3.8.2.3.
I'm running R 3.3.0 on windows server 2012 x64 (yeah sorry no access to a linux server :|).

I'm investigating the R 3.3 issue since I've recently switched from 3.2.5 but I don't think this should have anything 
to do with it.

Tom Kraljevic

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Jun 30, 2016, 10:23:03 AM6/30/16
to Aschyle, H2O Open Source Scalable Machine Learning - h2ostream, parindsh...@mail.jugnoo.in, jpk...@gmail.com, rbp...@scu.edu, avniw...@gmail.com

hi,

look in the h2o log file for an exception stack trace and paste it here.

tom

Sent from my iPhone

Aschyle

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Jun 30, 2016, 11:25:40 AM6/30/16
to H2O Open Source Scalable Machine Learning - h2ostream, mura...@gmail.com, parindsh...@mail.jugnoo.in, jpk...@gmail.com, rbp...@scu.edu, avniw...@gmail.com
So after lunch I re-ran the exact same thing and it worked both on R 3.3.0 and R 3.2.5.

Here is the error stack that was generated : 

06-30 11:33:35.907 127.0.0.1:54321       25532  #95976-17 INFO: Method: GET   , URI: /3/Frames/predictions_bfb5_DRF_model_R_1467278657227_1_on_RTMP_sid_a812_7, route: /3/Frames/(?<frameid>.*), parms: {frame_id=predictions_bfb5_DRF_model_R_1467278657227_1_on_RTMP_sid_a812_7, row_count=10}
06-30 11:35:29.987 127.0.0.1:54321       25532  #95976-12 INFO: Method: POST  , URI: /99/Models.bin/, route: /99/Models.bin/(?<modelid>.*), parms: {dir=./models/GBM_model_R_1462269640231_2, model_id=}
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: water.exceptions.H2OIllegalArgumentException: Illegal argument: dir of function: importModel: water.api.FSIOException: FS IO Failure: 
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR:  accessed path : file:/C:/Users/xxxxx/Documents/./models/GBM_model_R_1462269640231_2 msg: File not found
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at water.api.ModelsHandler.importModel(ModelsHandler.java:193)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at java.lang.reflect.Method.invoke(Method.java:606)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at water.api.Handler.handle(Handler.java:62)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at water.api.RequestServer.handle(RequestServer.java:655)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at water.api.RequestServer.serve(RequestServer.java:596)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at water.JettyHTTPD$H2oDefaultServlet.doGeneric(JettyHTTPD.java:740)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at water.JettyHTTPD$H2oDefaultServlet.doPost(JettyHTTPD.java:676)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:503)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.Server.handle(Server.java:370)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
06-30 11:35:29.989 127.0.0.1:54321       25532  #95976-12 ERRR: 	at java.lang.Thread.run(Thread.java:745)

So it seems to be a path issue since file:/C:/Users/xxxxx/Documents/./models/GBM_model_R_1462269640231_2 
is indeed not an actual file on my system, UNLESS . is understood as the current directory in the R session.

Why the same code didn't run into the same issue is beyond me. To rule out this possibility I might have to use
normalizePath(file.path(".", "models", xxx)) in the future.

leigh kao

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Sep 28, 2021, 10:53:32 AM9/28/21
to H2O Open Source Scalable Machine Learning - h2ostream
Did this ever get resolved?  
same error: 

aml=h2o.automl(y = "outcome", training_frame = train)

ERROR: Unexpected HTTP Status code: 500 Server Error (url = http://localhost:54321/99/AutoMLBuilder)

java.lang.NullPointerException
 [1] "java.lang.NullPointerException"                                                                              
 [2] "    water.nbhm.NonBlockingHashMap.putIfMatch(NonBlockingHashMap.java:369)"                                   
 [3] "    water.nbhm.NonBlockingHashMap.put(NonBlockingHashMap.java:320)"                                          
 [4] "    ai.h2o.automl.AutoMLSession.getModelingSteps(AutoMLSession.java:76)"                                     
 [5] "    ai.h2o.automl.ModelingStepsRegistry.getOrderedSteps(ModelingStepsRegistry.java:54)"                      
 [6] "    ai.h2o.automl.AutoML.getExecutionPlan(AutoML.java:330)"                                                  
 [7] "    ai.h2o.automl.AutoML.planWork(AutoML.java:359)"                                                          
 [8] "    ai.h2o.automl.AutoML.submit(AutoML.java:395)"                                                            
 [9] "    ai.h2o.automl.AutoML.startAutoML(AutoML.java:80)"                                                        
[10] "    water.automl.api.AutoMLBuilderHandler.build(AutoMLBuilderHandler.java:15)"                               
[11] "    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)"                                             
[12] "    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)"                                             
[13] "    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)"                                         
[14] "    java.lang.reflect.Method.invoke(Unknown Source)"                                                         
[15] "    water.api.Handler.handle(Handler.java:60)"                                                               
[16] "    water.api.RequestServer.serve(RequestServer.java:470)"                                                   
[17] "    water.api.RequestServer.doGeneric(RequestServer.java:301)"                                               
[18] "    water.api.RequestServer.doPost(RequestServer.java:227)"                                                  
[19] "    javax.servlet.http.HttpServlet.service(HttpServlet.java:707)"                                            
[20] "    javax.servlet.http.HttpServlet.service(HttpServlet.java:790)"                                            
[21] "    org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865)"                                  
[22] "    org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:535)"                              
[23] "    org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)"                       
[24] "    org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317)"                      
[25] "    org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)"                        
[26] "    org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)"                               
[27] "    org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)"                        
[28] "    org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219)"                       
[29] "    org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)"                           
[30] "    org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)"                   
[31] "    org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)"                         
[32] "    water.webserver.jetty9.Jetty9ServerAdapter$LoginHandler.handle(Jetty9ServerAdapter.java:130)"            
[33] "    org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126)"                   
[34] "    org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)"                         
[35] "    org.eclipse.jetty.server.Server.handle(Server.java:531)"                                                 
[36] "    org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352)"                                       
[37] "    org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)"                             
[38] "    org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281)"             
[39] "    org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102)"                                       
[40] "    org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)"                                    
[41] "    org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)"                  
[42] "    org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)"                
[43] "    org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)"               
[44] "    org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)"                      
[45] "    org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)"
[46] "    org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762)"                        
[47] "    org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680)"                         
[48] "    java.lang.Thread.run(Unknown Source)"                                                                    

Error in .h2o.doSafeREST(h2oRestApiVersion = h2oRestApiVersion, urlSuffix = page,  : 
  

ERROR MESSAGE:

Caught exception: java.lang.NullPointerException

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