Dspace 7 Front end error

[Keith Jones]

Hi,

I'm in the process of installing and running Dspace 7. I've installed
the backend and frontend on a Centos 8 machine. When I start the front
end, I get the following error:


[PM2] Spawning PM2 daemon with pm2_home=/home/dspace/.pm2
[PM2] PM2 Successfully daemonized
[PM2][WARN] Applications dspace-angular not running, starting...
[PM2] App [dspace-angular] launched (1 instances)
┌─────┬───────────────────┬─────────────┬─────────┬─────────┬──────────┬────────┬──────┬───────────┬──────────┬──────────┬──────────┬────────
──┐
│ id │ name │ namespace │ version │ mode │ pid
│ uptime │ ↺ │ status │ cpu │ mem │ user │ watchin
g │
├─────┼───────────────────┼─────────────┼─────────┼─────────┼──────────┼────────┼──────┼───────────┼──────────┼──────────┼──────────┼────────
──┤
│ 0 │ dspace-angular │ default │ N/A │ fork │ N/A
│ 0 │ 0 │ errored │ 0% │ 0b │ dspace │ disable
d │
└─────┴───────────────────┴─────────────┴─────────┴─────────┴──────────┴────────┴──

I checked the log file using this command: pm2 logs
Here is the output:

[TAILING] Tailing last 15 lines for [all] processes (change the value
with --lines option)
/home/dspace/.pm2/pm2.log last 15 lines:
PM2 | 2021-09-10T14:56:18: PM2 log: RPC socket file :
/home/dspace/.pm2/rpc.sock
PM2 | 2021-09-10T14:56:18: PM2 log: BUS socket file :
/home/dspace/.pm2/pub.sock
PM2 | 2021-09-10T14:56:18: PM2 log: Application log path :
/home/dspace/.pm2/logs
PM2 | 2021-09-10T14:56:18: PM2 log: Worker Interval : 30000
PM2 | 2021-09-10T14:56:18: PM2 log: Process dump file :
/home/dspace/.pm2/dump.pm2
PM2 | 2021-09-10T14:56:18: PM2 log: Concurrent actions : 2
PM2 | 2021-09-10T14:56:18: PM2 log: SIGTERM timeout : 1600
PM2 | 2021-09-10T14:56:18: PM2 log:
===============================================================================
PM2 | 2021-09-10T14:56:18: PM2 log: App [dspace-angular:0]
starting in -fork mode-
PM2 | 2021-09-10T14:56:18: PM2 log: App [dspace-angular:0] online
PM2 | 2021-09-10T14:56:18: PM2 error: Error: spawn /usr/bin/yarn ENOENT
PM2 | at Process.ChildProcess._handle.onexit
(internal/child_process.js:269:19)
PM2 | at onErrorNT (internal/child_process.js:467:16)
PM2 | at processTicksAndRejections
(internal/process/task_queues.js:82:21)
PM2 | 2021-09-10T14:56:18: PM2 error: Cancelling versioning data parsing


I'm new to 7 and not sure what is causing the error and where to start
troubleshooting, any help will be appreciated.

Thanks
Keith

[Mark H. Wood]

On Fri, Sep 10, 2021 at 03:07:30PM -0400, Keith Jones wrote:
> Hi,
>
> I'm in the process of installing and running Dspace 7. I've installed
> the backend and frontend on a Centos 8 machine. When I start the front
> end, I get the following error:
>

[snip]

> PM2 | 2021-09-10T14:56:18: PM2 log: App [dspace-angular:0] online
> PM2 | 2021-09-10T14:56:18: PM2 error: Error: spawn /usr/bin/yarn ENOENT
> PM2 | at Process.ChildProcess._handle.onexit
> (internal/child_process.js:269:19)
> PM2 | at onErrorNT (internal/child_process.js:467:16)
> PM2 | at processTicksAndRejections
> (internal/process/task_queues.js:82:21)
> PM2 | 2021-09-10T14:56:18: PM2 error: Cancelling versioning data parsing

It seems that you don't have 'yarn' installed for general use. (There
is no such file as '/usr/bin/yarn'.) This may help:

https://linuxize.com/post/how-to-install-yarn-on-centos-8/

--
Mark H. Wood
Lead Technology Analyst

University Library
Indiana University - Purdue University Indianapolis
755 W. Michigan Street
Indianapolis, IN 46202
317-274-0749
www.ulib.iupui.edu

[Tim Donohue]

Hi Keith,

If PM2 is throwing an odd error, I'd recommend starting basic first..  Try and simply run "yarn start" from the commandline for the UI.  This will build the UI for production and start it on port 4000 (by default).  This also will often provide you with a more useful error if the UI setup is incorrect.  Once you get it working via "yarn start", then go back to using PM2 (as PM2 helps ensure the app stays up and provides better monitoring/logging).

If you hit errors when running "yarn start", we have a number of common errors listed in the install guide & how to usually fix them: https://wiki.lyrasis.org/display/DSDOC7x/Installing+DSpace#InstallingDSpace-CommonInstallationIssues

If you have further questions let us know on this list.

Tim

---

From: dspac...@googlegroups.com <dspac...@googlegroups.com> on behalf of Keith Jones <mad...@udel.edu>
Sent: Friday, September 10, 2021 2:07 PM
To: DSpace Technical Support <dspac...@googlegroups.com>
Subject: [dspace-tech] Dspace 7 Front end error

 

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[Keith Jones]

Thanks Tim.

I am able to run the front end using the yarn start. When I go to the
url, I get some interface response but I'm also getting the following
errors:

Environment: Production
No _links section found at https://utley.lib.udel.edu/server/api
No _links section found at https://utley.lib.udel.edu/server/api
No _links section found at https://utley.lib.udel.edu/server/api


and errors continue:

ERROR Error: undefined doesn't contain the link sites
at MapSubscriber.project
(/home/dspace/SOFTWARE/dspace-angular-dspace-7.0/dist/server/main.js:256927:23)
at MapSubscriber._next
(/home/dspace/SOFTWARE/dspace-angular-dspace-7.0/node_modules/rxjs/internal/operators/map.js:49:35)
at MapSubscriber.Subscriber.next
(/home/dspace/SOFTWARE/dspace-angular-dspace-7.0/node_modules/rxjs/internal/Subscriber.js:66:18)
at MapSubscriber._next
(/home/dspace/SOFTWARE/dspace-angular-dspace-7.0/node_modules/rxjs/internal/operators/map.js:55:26)
at MapSubscriber.Subscriber.next
(/home/dspace/SOFTWARE/dspace-angular-dspace-7.0/node_modules/rxjs/internal/Subscriber.js:66:18)
at TakeSubscriber._next
(/home/dspace/SOFTWARE/dspace-angular-dspace-7.0/node_modules/rxjs/internal/operators/take.js:54:30)
at TakeSubscriber.Subscriber.next
(/home/dspace/SOFTWARE/dspace-angular-dspace-7.0/node_modules/rxjs/internal/Subscriber.js:66:18)
at FilterSubscriber._next
(/home/dspace/SOFTWARE/dspace-angular-dspace-7.0/node_modules/rxjs/internal/operators/filter.js:52:30)
at FilterSubscriber.Subscriber.next
(/home/dspace/SOFTWARE/dspace-angular-dspace-7.0/node_modules/rxjs/internal/Subscriber.js:66:18)
at MapSubscriber._next
(/home/dspace/SOFTWARE/dspace-angular-dspace-7.0/node_modules/rxjs/internal/operators/map.js:55:26)

Then I am getting some 200 reponses:

GET / 200 506.147 ms - -
GET /styles.0324863878df4752a58c.css 200 4.651 ms - 346
GET /dspace-theme.css 200 1.231 ms - -
GET /runtime-es2015.bfc7b4c3632b68fcfa67.js 200 7.956 ms - -
GET /assets/images/dspace-logo.svg 200 8.637 ms - -
GET /polyfills-es2015.473cd1992a6ad138d0e6.js 200 3.538 ms - -
GET /main-es2015.1404cdbe3f3368ec46fa.js 200 5.493 ms - -
GET /assets/fonts/fa-solid-900.woff2 200 1.171 ms - 80300
GET /25-es2015.b09d3ba9b53c98168491.js 200 8.464 ms - -
GET /assets/i18n/en.json5 200 6.916 ms - 126854
GET /79-es2015.1d3d2d87bd7969ff080d.js 200 3.644 ms - -
GET /80-es2015.1628eec9b3c265b32bc3.js 200 1.180 ms - -
GET /82-es2015.9124c792844bf9d9a09c.js 200 2.031 ms - -
GET /common-es2015.a61f806adcb8ed987a9a.js 200 7.944 ms - -
GET /assets/images/favicon.ico 200 1.089 ms - -

Still when I try to compile and run the front end, i'm still getting
the same error.

Keith

[Tim Donohue]

Hi Keith,

Take a look at the hints/tips in our Installation Docs for "No _links section found at.." errors: https://wiki.lyrasis.org/display/DSDOC7x/Installing+DSpace#InstallingDSpace-%22No_linkssectionfoundat...%22errorfromUserInterface

It sounds like your UI cannot "see" your REST API at https://utley.lib.udel.edu/server/api (or it's somehow being blocked?)

Tim

---

From: Keith Jones <mad...@udel.edu>
Sent: Friday, September 17, 2021 3:06 PM
To: Tim Donohue <tim.d...@lyrasis.org>
Cc: DSpace Technical Support <dspac...@googlegroups.com>
Subject: Re: [dspace-tech] Dspace 7 Front end error