use UnrealEngine 
Cannot pack ,forcing save package, and it just hangs there, entire night doing that.
log:
Cook: LogCook: display: Forcing save package E:/…/Content/MMO/NewCharacter/GuyMaterial.uasset because was already requeued once
Cook: LogCook: display: Forcing save package E:/…/Content/MMO/Quests/StartsQuestMat.uasset because was already requeued once
Migrating assets to another project is not the solution.
Deleting Saved/Intermediate/Build/Binaries Folders aren’t working, too.
Fixing the Redirectors doesn’t help, either.
