Migration Assistance Error

Basically my music, ebooks and a bucket load of movies won't transfer from this Mac to my new Mac. This MacBook Air (2013) and the one I bought is the MacBook Air (2020). I don't really know what's causing this error. But I would really like to not move one by one each and every single music file and book I have as that would take a lot of time. Any help?

(Also does Migration Assistance copy the safari bookmarks and passwords since it seems like that too wasn't copied)