Did you see this forum post: https://forum.mendix.com/link/questions/102342 ?

Can you update your model?

And see also the documentation here: https://docs.mendix.com/howto8/collaboration-requirements-management/troubleshoot-network-issues-for-team-server

And also check this forum post: https://forum.mendix.com/link/questions/94078

Install SmartSVN to manually fix any sync errors.

Regards,

Ronald