The media referenced by this xml document is incompatible with existing media in this library

Im getting this error after syncing some files with plural eyes 4. I have all the media in my main library, so I don't get why this is happening. And it also doesn't let me copy the videos to the main project, as in it copies them completely black and says that im importing media between libraries. I have the last version of Final Cut Pro X. MacOS High Sierra 10.13.6

So, the only way I found it crate a new library, import xml in this library, fc automatically crate new project and event with this xml. And after that i copy project in the original library. Or you can try to reinstall your fc