org agenda fails, "wrong type argument: number-or-marker-p" #8000
After updating packages, on attempting to load org-agenda (even on startup (since I have org-agenda items on the home screen)) it fails and I get the error "Wrong type argument: number-or-marker-p, <2016-12-30 Fri>" or another datestamp.
Reverting my updated packages seemed to fix the bug, but I would like to be able to use the latest version of stuff.
I can confirm this. Repeated tasks and their timestamps are causing this problem.
This is how you reproduce the bug:
It will cause the following error message to display in the minibuffer when you run
This is how you fix it: remove
I'm on org mode version 9.0.2 (Emacs 25.1, Windows).
Edit: Also, both of the following 2 lines were causing the same issue in another org file of mine: