Error deploying shiny app in V 4.0.0

[andresrcs]

Just to clarify, Do you mean deploying to shinyapps.io right? If that is the case, take a look at this answer

Shinyapps.io can't deploy apps built with R 4.0.0

The major version number change has exposed some places where we had made assumptions. We are working through those issues and aim to be able support R 4.0.0 on shinyapps.io later this week.