Google Drive Page Not Found – Sorry, unable to open the file at this time
I think you are logged in with two gmail account: That is why (/u/1,/u/0) may have been appended to script address (may be a bug). So what you have to do is remove /u/0 or whatever is appended. ForExample: https://script.google.com/macros/u/1/s/ffffsdds/exec becomes https://script.google.com/macros/s/ffffsdds/exec