ERROR: app.R did not return a shiny.appobj object.

[Luck Buttered]

I have an app.R file. It contains the general structure as follows:

ui <- fluidPage()

server <- function(input, output)

shinyApp(ui, server)

I placed the app.R file inside a directory called "App".

Then, I issue the command:

runApp("App")

However, I do not see a functioning app. Instead, I receive the error:

ERROR: app.R did not return a shiny.appobj object.

When I searched for this error online, I only found one piece of advise to follow the rules denoted on the following help site:

http://shiny.rstudio.com/articles/single-file.html

I believe I am following those rules, and so I am a bit stuck on what I should consider next. If anyone has any advice they can offer, I would be grateful!

[Joe Cheng]

Does your server function really not have curly braces? Because that would cause the shinyApp() call on there next line to be treated as the function body of server, rather than its own top level expression.

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[Austin Hart]

I think I am a little late to the call, but this happened to me today. I resolved the problem by setting my working directory to the folder that contains my app.