Greetings @Toutjimbwa
Welcome back to the forum! I pulled some info on this. This user ran into a similar problem and seemed to find a solution: Couldn't find file for package
I also found what seems to be a fairly successful method from a Reddit user here as well: https://www.reddit.com/r/unrealengine/comments/y7oivd/how_i_fixed_couldnt_find_file_for_package_error/?rdt=33046
(Keep in mind that Reddit posts are third party and not associated with Epic for this. So, proceed with their instructions at your own risk. But, it seems to have helped solve the issue for several other users)
Let me know how it goes!