#avid mc error message

[helloavid]

For the last 13 seconds of my composition, Avid keeps giving me this error message. 

I've tried removing all effects from the sequence and adding them again (dissolves and the SpectraMatte for the main clip) and I've even re-rendered my After Effects graphics (which have no problems anywhere else in the sequence) and re-imported them.

I am working with AMA material but the my whole sequence has AMA material, so why should this last bit matter?