ShinyProxy Euler App not running - Failed to start container - r

Question

I am new to docker and ShinyProxy. I was following the steps from https://www.shinyproxy.io/. All is working fine with the Hello-world and 06_tabset apps. Then I have build the Image for the Euler App which is not working when opening the app from the browser.
Error
Status code: 500
Message: Failed to start container
Stack Trace:
eu.openanalytics.containerproxy.ContainerProxyException: Failed to start container
EDIT:
The actual error is:
Caused by: com.spotify.docker.client.exceptions.DockerRequestException: Request error: POST http://localhost:2375/containers/create: 400, body: {"message":"No command specified"}
also when I try to just run the App it is not working with:
sudo docker run -p 3838:3838 openanalytics/shinyproxy-demo R -e 'shiny::runApp('/root/euler')'
the Error I get is:
shiny::runApp(/root/euler)
Error: unexpected '/' in "shiny::runApp(/"
Execution halted
and after changing it to:
sudo docker run -p 3838:3838 openanalytics/shinyproxy-demo R -e 'shiny::runApp('root/euler')'
I get this:
Error in as.shiny.appobj(appDir) : object 'root' not found
Calls: <Anonymous> -> as.shiny.appobj
Execution halted

Answer 1

I think the problem could be that the Image is openanalytics/shinyproxy-template and not openanalytics/shinyproxy-demo.
try:
sudo docker run -p 3838:3838 openanalytics/shinyproxy-template R -e 'shiny::runApp("/root/euler")'

Answer 2

just try this :
sudo docker run -p 3838:3838 openanalytics/shinyproxy-demo R -e 'shiny::runApp("/root/euler")'
the problem is that you use ' twice in your command that is why the app sees that as 'shiny::runApp(/'
and make sure that Shiny application exists at the path "/root/euler".