Shiny server suddenly resulting in 500 error for all apps/Rmds

[daattali]

I've had a shiny server deployed since 2015, and have never had any issues with it.

A few weeks ago all of a sudden it started returning a 500 page for any app in it.

I checked them logs, and any shiny app that I try to access has this in its log:

Warning: Error in mfunc: attempt to apply non-function
  1: runApp

Any Rmd file that I try to access has

Warning: Error in mfunc: attempt to apply non-function
  1: rmarkdown::run

I tried creating a blank Rmd and a blank shiny app, then restarting the machine and then restarting the shiny-server. Still resulting in a 500 errors. Does anyone have experience with this or know what can be causing this?

[FJCC]

Updating packages seems to have fixed a similar problem.

Shiny not working, attempt to apply non-function

I'm trying to get Shiny to work, but even the built-in examples do not work. They only open a browser page with "An error occurred, attempt to apply a non-function". How can I fix this? See attached screenshot with session info. [afbeelding] I also tried a basic Hello World example copy-pasted from a tutorial, with in "app.R" the following code: ui <- fluidPage("Hello, world!") server <- function(input, output, session) {} shinyApp(ui, server) This has the same result, with a slightly different error message in RGui: Warning: Error in mfunc: attempt to apply non-function 1: shiny::runApp

[daattali]

Turns out it was sort of the opposite of updating packages.

{bslib} v0.4.0 (which is the latest CRAN version) is what caused the issue. When I install bslib 0.3.0 my shiny server works. When I install bslib 0.4.0 the entire server breaks.

Error in mfunc: attempt to apply non-function