I'm an IT admin attempting to help someone with their Shiny app. We've got RStudio and Shiny running on the same server and Shiny is configured by user so folks can deploy their apps into /home/user/ShinyApps. I have one user that has been doing this for awhile and some of his apps work, but several others display this error.
If I open the server.R or ui.R files from RStudio (pointing to the same R that Shiny uses BTW) and click Run App, the web page opens fine, but if I try to access the app through the Shiny web server, I get the error.
As far as I can tell, all of the necessary R packages are installed and permissions in his ShinyApps directory are fine. I'm unsure where else to look and nothing is showing up in /home/user/ShinyApps/log either.