don’t know about this one but ae sometime crashes if timeline scripts are messed up. One time it crashed because I activate the bold version of a font instead the normal variant. And off course plugins.
start by narrow down what plugin you used, what last changes you made before getting this error. If you had the backup save on just turn back at a previous save and see if you get the same problem.
Can you reproduce it? Is it a one off or is it happening all the time. If it’s in some way reproducible, then file it as a bug.
MCExportInfo…. Is MC something to do with Media Core? Are you using MP? Were you rendering at the time, previewing, working on the timeline?
Is this the same project that was going to take a month to render or whatever?