How to solve this error when I try to migrate contend?

Some selected assets don’t have a corresponding content root in the destination.
/Niagara

Would you like to migrate all selected assets into a folder with consolidated references? Without migrating into a folder the assets in the above roots will not be migrated.

// This is the popup I get while doing the tutorial video Working With Additional Assets at 7:19. I get no other popup and at this point the migration does not happen when I click yes and the engine freezes (can only close it through task manager). However other projects that I have opened at the same time in the engine work as normal.