I got this error Report when trying to load an autosave from ExerPitchBlack2017 (autosave after game Crash).
After this Report the program crashed again. Tried again to load autosave.scen, then it worked.
This problem has been resolved in Build 452. (I know, since B452 is a private beta this doesn't help you much right now but at least you know the fix is coming).