Hey !
I use a Dynamo Script to create sheets based on section views using the node sheet.bynamenumberTitleBlockAndView.
I am not using any of the characters \ : { } | ; < > ? ` ~ on the sheets names but I got this error
Name cannot contain any of the following characters sheets \ : { } | ; < > ? ` ~…
What characters are you using?
Names such as TEST1, TEST2, TEST3 and so on and Numbers such as 01, 02, 03 …
Check your views list, you may have gotten view templates mixed in and some of those (revision) will have funny characters much like the Default 3D views do as well.