Nextcloud does not sychronize on mac anymore

Nextcloud Desktop-Client 3.13.0
macOS 14.5

I use nextcloud in my organization to save and share large video files. The synchronization was working before but at some point it stopped working. I updated and redownloaded nextcloud, stopped the synchronization and synchronized it again but nothing worked out. When I click “edit locally” on the web version I get the error “File for local editing could not be found. Make sure that it is not excluded by selective synchronization.” Also I get the error “server replied not found”

Does anyone know how to resolve this issue?