Error after an update app deployed : Unable to connect to worker after 60.00 seconds; startup took too long.

Hi,
I updated one of my shiny apps then I deployed the new version, but I get this error on browser page.
Unable to connect to worker after 60.00 seconds; startup took too long.

The app have to connect to googledocuments to get the data using googlesheets library in R

On dashboard of shinyapps.io the app seems there is no problem.

If I try to deploy the simple shiny.app which is proposed when I open a new shiny document in Rstudio I have no problem.

Any suggestion?

thank you very much
Massimo