My ShinyApp runs in RStudio but fails as a ShinyApp

[Dan Hong]

I'm having an issue that I can't debug and was hoping someone here can help. My Iris app is a simple ShinyApp for making a prediction about the iris class based on user-inputted petal length and width. To do this, the app uses the built-in iris dataset as well as caret and rattle libraries. It runs fine on my computer and seems to deploy successfully to ShinyApps.io, but when I go to the app's webpage, I get an error message saying that "The application unexpectedly exited. Diagnostic information has been dumped to the JavaScript error console."

My ShinyApp is at: https://dnaeye.shinyapps.io/iris/

Copy of the code is at: https://github.com/dnaeye/iris

[Tareef Kawaf]

Dan,

Could you take a look at the JavaScript console and send us the error you are seeing there?

Also, if you could send us a link to your application and the output of shinyapps::showLogs() we would appreciate it.

-Tareef

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[Dan Hong]

From Firefox's Web Console:

"

Listening on http://127.0.0.1:60293

Loading required package: lattice

Loading required package: ggplot2

Rattle: A free graphical interface for data mining with R.

Version 3.3.0 Copyright (c) 2006-2014 Togaware Pty Ltd.

Type 'rattle()' to shake, rattle, and roll your data.

Error in checkInstall(models$library) : 

"

When I tried running the showLogs function (shinyapps::showLogs()), I got the following error message:

Error: 'showLogs' is not an exported object from 'namespace:shinyapps'

[Andy Kipp]

Dan,

Can you update your version of shinyapps package and run showLogs()?

devtools::install_github('rstudio/shinyapps')

-Andy

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[Dan Hong]

Hi Andy,

I've updated shinyapps with the command you gave me, and now the showLogs() command brings up:

2014-11-12T00:00:28.309493+00:00 shinyapps[shuttle]: 1 package is needed for this model and is not installed. (rpart). Would you like to try to install it now?Error in checkInstall(models$library) : 

2014-11-12T00:02:57.863311+00:00 shinyapps[shuttle]: R version: 3.0.2

2014-11-12T00:02:57.864483+00:00 shinyapps[shuttle]: rmarkdown version: 0.0.0

2014-11-12T00:02:57.863375+00:00 shinyapps[shuttle]: Shiny version: 0.10.1

2014-11-12T00:02:57.864904+00:00 shinyapps[shuttle]: knitr version: 0.0.0

2014-11-12T00:02:58.203928+00:00 shinyapps[shuttle]: 

2014-11-12T00:02:58.203933+00:00 shinyapps[shuttle]: Starting Shiny with process ID: '33'

2014-11-12T00:02:58.216797+00:00 shinyapps[shuttle]: 

2014-11-12T00:02:58.216799+00:00 shinyapps[shuttle]: Listening on http://0.0.0.0:37889

2014-11-12T00:02:59.776067+00:00 shinyapps[shuttle]: Loading required package: lattice

2014-11-12T00:02:59.835161+00:00 shinyapps[shuttle]: Loading required package: ggplot2

2014-11-12T00:03:02.507103+00:00 shinyapps[shuttle]: Rattle: A free graphical interface for data mining with R.

2014-11-12T00:03:02.507108+00:00 shinyapps[shuttle]: Version 3.3.0 Copyright (c) 2006-2014 Togaware Pty Ltd.

2014-11-12T00:03:02.507109+00:00 shinyapps[shuttle]: Type 'rattle()' to shake, rattle, and roll your data.

2014-11-12T00:03:02.658158+00:00 shinyapps[shuttle]: 1 package is needed for this model and is not installed. (rpart). Would you like to try to install it now?Error in checkInstall(models$library) : 

2014-11-12T00:06:06.853231+00:00 shinyapps[shuttle]: R version: 3.0.2

2014-11-12T00:06:06.855078+00:00 shinyapps[shuttle]: rmarkdown version: 0.0.0

2014-11-12T00:06:06.853307+00:00 shinyapps[shuttle]: Shiny version: 0.10.1

2014-11-12T00:06:06.855805+00:00 shinyapps[shuttle]: knitr version: 0.0.0

2014-11-12T00:06:07.245558+00:00 shinyapps[shuttle]: 

2014-11-12T00:06:07.245564+00:00 shinyapps[shuttle]: Starting Shiny with process ID: '12'

2014-11-12T00:06:07.264408+00:00 shinyapps[shuttle]: 

2014-11-12T00:06:07.264410+00:00 shinyapps[shuttle]: Listening on http://0.0.0.0:41583

2014-11-12T00:06:13.587584+00:00 shinyapps[shuttle]: Loading required package: lattice

2014-11-12T00:06:13.651091+00:00 shinyapps[shuttle]: Loading required package: ggplot2

2014-11-12T00:06:16.470639+00:00 shinyapps[shuttle]: Rattle: A free graphical interface for data mining with R.

2014-11-12T00:06:16.470644+00:00 shinyapps[shuttle]: Version 3.3.0 Copyright (c) 2006-2014 Togaware Pty Ltd.

2014-11-12T00:06:16.470645+00:00 shinyapps[shuttle]: Type 'rattle()' to shake, rattle, and roll your data.

2014-11-12T00:06:16.624444+00:00 shinyapps[shuttle]: 1 package is needed for this model and is not installed. (rpart). Would you like to try to install it now?Error in checkInstall(models$library) : 

2014-11-12T00:14:24.044334+00:00 shinyapps[shuttle]: R version: 3.0.2

2014-11-12T00:14:24.045714+00:00 shinyapps[shuttle]: rmarkdown version: 0.0.0

2014-11-12T00:14:24.044403+00:00 shinyapps[shuttle]: Shiny version: 0.10.1

2014-11-12T00:14:24.046263+00:00 shinyapps[shuttle]: knitr version: 0.0.0

2014-11-12T00:14:24.395679+00:00 shinyapps[shuttle]: 

2014-11-12T00:14:24.395685+00:00 shinyapps[shuttle]: Starting Shiny with process ID: '12'

2014-11-12T00:14:24.408747+00:00 shinyapps[shuttle]: 

2014-11-12T00:14:24.408750+00:00 shinyapps[shuttle]: Listening on http://0.0.0.0:56428

2014-11-12T00:14:30.560127+00:00 shinyapps[shuttle]: R version: 3.0.2

2014-11-12T00:14:30.561408+00:00 shinyapps[shuttle]: rmarkdown version: 0.0.0

2014-11-12T00:14:30.560175+00:00 shinyapps[shuttle]: Shiny version: 0.10.1

2014-11-12T00:14:30.561869+00:00 shinyapps[shuttle]: knitr version: 0.0.0

2014-11-12T00:14:30.942797+00:00 shinyapps[shuttle]: 

2014-11-12T00:14:30.942802+00:00 shinyapps[shuttle]: Starting Shiny with process ID: '25'

2014-11-12T00:14:30.955730+00:00 shinyapps[shuttle]: 

2014-11-12T00:14:30.955732+00:00 shinyapps[shuttle]: Listening on http://0.0.0.0:49995

2014-11-12T00:14:32.841629+00:00 shinyapps[shuttle]: Loading required package: lattice

2014-11-12T00:14:32.907499+00:00 shinyapps[shuttle]: Loading required package: ggplot2

2014-11-12T00:14:35.554947+00:00 shinyapps[shuttle]: Rattle: A free graphical interface for data mining with R.

2014-11-12T00:14:35.554952+00:00 shinyapps[shuttle]: Version 3.3.0 Copyright (c) 2006-2014 Togaware Pty Ltd.

2014-11-12T00:14:35.554953+00:00 shinyapps[shuttle]: Type 'rattle()' to shake, rattle, and roll your data.

2014-11-12T00:14:35.706639+00:00 shinyapps[shuttle]: 1 package is needed for this model and is not installed. (rpart). Would you like to try to install it now?Error in checkInstall(models$library) :

It would seem like the rpart package hasn't been installed, but it is.

​
​

[Tareef Kawaf]

Does the code have an explicit: library(rpart) in it?

If not, would you mind adding it appropriately and redeploying?

[Dan Hong]

That was the key. I had to explicitly call the related libraries rpart, e1071, and rpart.plot in the server.R file. Thanks, Tareef, Andy!