Some of the ThoughtDefs revolving around humans seem to have changed names at one point or another:
If one of your alien race mods is still using the old names, it may cause this error.
Code Select
AteHumanIngredient -> AteHumanlikeMeatAsIngredient
KnowButcheredHuman -> KnowButcheredHumanlikeCorpse
If one of your alien race mods is still using the old names, it may cause this error.