Error migrating from non versioned project to a perforce versioned one

Hi, i’m trying to migrate some updated assets from a non versioned project to a perforce versioned one. but UE editor still give generic “copy error” and no file is copied.
For instance, migrating new assets gives no error and everything goes smooth.

The edits are too many to apply them by hand one asset at a time, so this is a great pain in the ■■■.

Has anyone ever experienced this problem? Is there a solution/workaround?

thanks in advance