Collaboration server error

While working in a project, this error popped up:

Collaboration server error

Error occured with collaboration the server. You can still edit the project but this could lead to synchronization problems with other online users. Or you can close project without saving.

service-unavailable: Remote Server Error

I was not able to continue, even when clicking the "Continue without collaboration" button". I was not collaborating with another person at the time.
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