Issue: Authorization is required to perform that action.

[Guillermo Hernández]

Barely I opened the add-on, the script is returning an error:

ScriptError: Authorization is required to perform that action.

All permissions were allowed on the instalation.

[Matthijs Collard]

I had the same issue but I was logged in with different Google accounts. So I created a new document from the template, but I was using it with another account. I signed out with one account and started over and the error did not occur. This might be your problem too. 

[ju...@goat.digital]

I also just got hit with the same problem, changing accounts or doc sharing settings doesnt work.

Im stuck.

[Jesse McCabe]

That is odd.  The error is a pass through from Google: the script is attempting to make a change to a document that your account does not have rights to edit.  There isn't much I can do from the script side to fix it, but I will see what I can do to recreate it using multiple accounts and then I'll write up some steps to fix, and add them to the add-on when it does occur. 

[Bob Hyman]

As a workaround, try logging out of all google accounts, closing all browser tabs, then reopening just one browser on the slides.  Worked for me!  

I think it is some Google botch managing multiple sessions with different users.

Found this suggestion at: https://groups.google.com/forum/#!topic/google-analytics-spreadsheet-add-on/f2AL49u0VuA