Stopping the error “Authorisation is required to perform that action” in Google Apps Script

Question

I keep getting this error message when I try to view my deployed app.

Authorisation is required to perform that action

How do I

Answer 1

You need to go the script editor and attempt to run any function manually first.

A first authorization popup is shown when you first deploy as web app, but if you go and change the code accessing new services you have to re-authorize it.