I am testing on the Shiny 1.5.0.9xxx version from github. I noticed the original error traceback is gone. Only a very simple message:
Warning: Error in exists: invalid first argument
1: runApp
In < v1.5
Warning: Error in exists: invalid first argument
82: exists
81: self$exists
80: oldInputs$available
79: restoreInput
78: selectInput
73: selectizeInput
72: observeEventHandler [R/xxx.R#323]
1: runApp
I tried with new devmode() function but still the same. The only way I know right now is options(shiny.fullstacktrace = TRUE). Is there any new config that I'm missing in the new version?