I have had some reports of DocsList errors from folks using the Google Docs Writing Tracker. This is because those functions have been deprecated. Several months ago, I updated the master branch with code that uses the newer DriveApp object model. I have been using that code for a few months with no errors. If you are seeing errors in the last few days caused by DocsList objects, I recommend you pull the latest version of the scripts. That should fix the problem. Please see the readme for additional details and instructions.