Collab File is Missing Error

Editor: 2019.2.0f1 Personal
Collaborate: 2.0.0 preview.17

This issue has happened several times to me and my teammate who I collaborate with. After one successfully uploads changes, the other will try to download those changes. Sometime during the download, we will get a "File is Missing" error. There is no error in the console, just a red banner which appears across the top of the collab drop down with that message.

It then shows like it is ready to try again, but it won't ever download successfully.

Tried:
Closing and reopening editor
Making small changes and sending another upload from the user who sent the original upload
Looked online and found this: https://forum.unity.com/threads/file-is-missing-error.456186/

Seems like this was an issue before, and was supposedly fixed, but obviously not totally. We have now had to use the "delete whole project and download everything again" resolution, which is a poor solution. We have over 20GB of data in collab, and it causes painful disruptions when this happens.

Expectations:
1. Please fix this issue
2. What causes this to happen? I would like to know EXACTLY what causes this, so we can avoid those actions in the future
3. Are there any other solutions which we can use to fix this, without needing to re-download everything again?

 

Hi @brycebos11, I understand your frustration. In the Editor.log, which you can open from the Console, you should see the "File is missing" error, along with which exact file is causing the error. Typically, this can happen when a file has been modified outside of Unity (or outside of Collab's ability to detect the change) during a publish or update. This error can often be resolved by checking in the Editor.log which file is missing and putting it back where Collab expects it.

 

I encountered this error too.
Here is my Editor.log

[Collab 2020-0925 05:50:27 GMT][Error] 'File is missing' (37) returned in './Editor/Src/Collab/Jobs/CollabUpdateAsyncJob.cpp' at line 785
RefreshInfo: StopAssetImportingV2(ForceSynchronousImport)
RefreshProfiler: Total: 12.251ms
InvokeBeforeRefreshCallbacks: 0.233ms
ApplyChangesToAssetFolders: 0.109ms
WriteModifiedImportersToTextMetaFiles: 0.000ms
CleanLegacyArtifacts: 0.000ms
Scan: 1.211ms
OnSourceAssetsModified: 0.000ms
UnregisterDeletedAssets: 0.000ms
InitializeImportedAssetsSnapshot: 5.615ms
GetAllGuidsForCategorization: 0.000ms
CategorizeAssets: 0.000ms
ImportAndPostprocessOutOfDateAssets: 0.000ms (0.000ms without children)
ImportManagerImport: 0.000ms (0.000ms without children)
ImportInProcess: 0.000ms
ImportOutOfProcess: 0.000ms
UpdateCategorizedAssets: 0.000ms
RemoteAssetCacheGetArtifact: 0.000ms (0.000ms without children)
RemoteAssetCacheResolve: 0.000ms
RemoteAssetCacheDownloadFile: 0.000ms
CompileScripts: 0.000ms
PostProcessAllAssets: 0.000ms
ReloadImportedAssets: 0.000ms
VerifyAssetsAreUpToDateAndCorrect: 0.000ms
EnsureUptoDateAssetsAreRegisteredWithGuidPM: 0.000ms
InitializingProgressBar: 0.000ms
PostProcessAllAssetNotificationsAddChangedAssets: 0.000ms
OnDemandSchedulerStart: 0.000ms
RestoreLoadedAssetsState: 0.000ms
InvokeProjectHasChanged: 0.000ms
UpdateImportedAssetsSnapshot: 0.000ms
ReloadSourceAssets: 0.000ms
UnloadImportedAssets: 0.000ms
Hotreload: 0.005ms
FixTempGuids: 0.003ms
VerifyGuidPMRegistrations: 0.000ms
GatherAllCurrentPrimaryArtifactRevisions: 0.844ms
UnloadStreamsBegin: 0.114ms
LoadedImportedAssetsSnapshotReleaseGCHandles: 0.732ms
GetLoadedSourceAssetsSnapshot: 0.828ms
PersistCurrentRevisions: 0.000ms
UnloadStreamsEnd: 0.012ms
GenerateScriptTypeHashes: 0.000ms