Ubuntu server runs shiny-server but shows 'application failed to start'

[Ragu Spag]

I installed the free opensource shiny-server on a Ubuntu server :
Linux ubuntu-server 3.16.0-62-lowlatency #83~14.04.1-Ubuntu SMP PREEMPT Fri Feb 26 23:33:34 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Ubuntu 14.04.4 LTS \n \l

When I run "sudo service shiny-server restart" and go to the page I get the following error:  Browser error

Any suggestions on how to get the backend to work?

  

[Fereshteh Karimeddini]

Do you have "shiny" package installed? It should be installed globally, available to shiny user. Please refer to this section of Admin Guide:

http://rstudio.github.io/shiny-server/latest/#install-shiny

[Ragu Spag]

Just to make sure I reinstalled shiny on linux Ubuntu  Rscript -e 'install.packages("shiny",dependencies=TRUE)'
which installs it system wide. Does shiny install in another location besides the standard R library?
Get the same error


my log shows [2016-03-11 16:06:57.742]
[WARN] shiny-server - Running as root unnecessarily is a security risk! You could be running more securely as non-root.
[2016-03-11 16:06:57.745] [INFO] shiny-server - Starting listener on 0.0.0.0:8000
[2016-03-11 16:06:59.700] [INFO] shiny-server - Error getting worker: Error: The application exited during initialization.
[2016-03-11 16:06:59.709] [INFO] shiny-server - Error getting worker: Error: The application exited during initialization.

[Fereshteh Karimeddini]

A couple of suggestions:

- Please check where the package is installed. You can run "installed.packages()" command in an R shell, or RStudio, and check for the location of "shiny" package. It might have been installed in a user's library instead of the site/global library.

- Depending on the version of Shiny Server you can define the following in your /etc/shiny-server/shiny-server.conf file:

preserve_logs true;

And restart server. Then access the Welcome page again. With this setting, now the application log files will remain. You can check /var/log/shiny/server directory for the latest version of the application logs; there might be more information in the log file.

Fereshteh