Error message : No stack trace available

Hi all,
I have a some issues in my code when i try to deployed a shiny app in the server rstudioconnect.
I have created a application that execute the rmarkdown code, in local i obtain in ouptut a file pdf. But when i launch my application in the server i got this error message :

06/07 13:45:03.301 (GMT) 
Warning: Error in : `.x` is empty, and no `.init` supplied 

06/07 13:45:03.304 (GMT) 
[No stack trace available] 

I have a config.yml file to address environment variables locally and on the server storage disk