Collaborate "An Error Occurred" , i need to restore the Project!

Hello,

iam getting the error "An Error Occurred" when i try to get to the actual stand of my project.

Why does this occur ?

[Collab 2019-0122 13:11:11 GMT][Error] 'Cannot get revision from server' (8) returned in 'C:\buildslave\unity\build\Editor/Src/Collab/Requests/RevisionRequests.cpp' at line 287
[Collab 2019-0122 13:11:11 GMT] GetRevisionsRequest failed, Reason: 299 Url: https://collab.cloud.unity3d.com/ap...sion=17349a19914d05a434c4743c4d6df292887ea9b1 Result:
[Collab 2019-0122 13:11:11 GMT][Error] 'Cannot get revision from server' (8) returned in 'C:\buildslave\unity\build\Editor/Src/Collab/Requests/RevisionRequests.cpp' at line 287
[Collab 2019-0122 13:11:11 GMT] GetRevisionsRequest failed, Reason: 299 Url: https://collab.cloud.unity3d.com/ap...sion=17349a19914d05a434c4743c4d6df292887ea9b1 Result:
[Collab 2019-0122 13:11:11 GMT][Error] 'Cannot get revision from server' (8) returned in 'C:\buildslave\unity\build\Editor/Src/Collab/Requests/RevisionRequests.cpp' at line 287
[Collab 2019-0122 13:11:11 GMT] GetRevisionsRequest failed, Reason: 299 Url: https://collab.cloud.unity3d.com/ap...sion=17349a19914d05a434c4743c4d6df292887ea9b1 Result:
[Collab 2019-0122 13:11:11 GMT][Error] 'Cannot get revision from server' (8) returned in 'C:\buildslave\unity\build\Editor/Src/Collab/Requests/RevisionRequests.cpp' at line 287
[Collab 2019-0122 13:11:11 GMT] GetRevisionsRequest failed, Reason: 299 Url: https://collab.cloud.unity3d.com/ap...sion=17349a19914d05a434c4743c4d6df292887ea9b1 Result:
UPID Received '6b17fa81-43bf-463c-8c61-0af3e57e9128'.
Refreshing native plugins compatible for Editor in 0.79 ms, found 3 plugins.
Preloading 1 native plugins for Editor in 0.17 ms.
[Collab 2019-0122 13:11:15 GMT][Error] 'Cannot download entry' (28) returned in 'C:\buildslave\unity\build\Editor/Src/Collab/Jobs/CollabResyncToRevisionJob.cpp' at line 307
UPID Received '6b17fa81-43bf-463c-8c61-0af3e57e9128'.

Thank you!