FAB Asset missing manifest won't download

General Issues & Bug Reporting (Fab)
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21

I really wish it didn’t force us to download straight into a project to see the Unreal Project files. I wish I could just download the files locally, and add them how I want.

Sometimes I just want to look at what’s in there, and having to have a throwaway project to see the files feels unnecessarily cumbersome.

Platform Compatible Listing:
https://www.fab.com/listings/0c8f3917-2461-4775-a853-b995bb93bac5

Log Output

[2025.01.17-22.37.33:066][518]LogPortal: FCommunityPortalOSSImpl::RequestAppManifest 89efe5924d3d467c839449ab6ab52e7f:e20511e6a0d147feb53f7a2005b64482:AnimalsFf74545ae782cV2  22
[2025.01.17-22.37.33:068][518]LogPortal: Display: FCommunityPortalOSSImpl::RequestSignedDownload using FAB service to retrieve manifest info
[2025.01.17-22.37.33:068][518]LogOnline: Verbose: OSS: Starting RequestArtifactManifest request.
[2025.01.17-22.37.33:068][518]LogOnline: VeryVerbose: MCP: Queuing Mcp request for user=b85aa3d10f3744f8a262c8dff8511e77 url=https://www.fab.com/e/artifacts/AnimalsFf74545ae782cV2/manifest
[2025.01.17-22.37.33:082][519]LogOnline: VeryVerbose: MCP: Running Mcp request for user=b85aa3d10f3744f8a262c8dff8511e77 url=https://www.fab.com/e/artifacts/AnimalsFf74545ae782cV2/manifest
[2025.01.17-22.37.33:401][538]LogOnline: Warning: OSS: Invalid response. CorrId=UE4-64ada901461744756f1e2f959c657351-20637B5143187F9A64D1AF89F18A37C7-7FB560BE4F7E68DB06B2BEB9130ED471 code=404 errorcode=JsonErrorUnknownCode errormessage=Server error of type JsonErrorUnknownCode errorraw={"Not Found":"Could not find any manifest download info with artifactId=AnimalsFf74545ae782cV2"}
[2025.01.17-22.37.33:401][538]LogOnlineFAB: Warning: OSS: GetVaultLibrary_HttpRequestComplete - request failed
[2025.01.17-22.37.33:401][538]LogPortal: Error: FCommunityPortalOSSImpl::OnHandleRequestFabManifestComplete failed! 0 0
[2025.01.17-22.37.33:401][538]FCommunityPortalVaultCache: ERROR: Manifest download fail - 89efe5924d3d467c839449ab6ab52e7f:e20511e6a0d147feb53f7a2005b64482:AnimalsFf74545ae782cV2```
22

This is a big issue for Linux users, because Linux compatibility is more often not set than it is.
But packs that are Meshes/Materials/Blueprint always worked for me in Linux. No matter if Linux compatibility was set. The only thing that might be a Problem is C++ Plugins. They only work when they provide the source, and sometimes some manual fixes are needed.

It might be a better solution to show a Message that the asset might not be compatible, but allow the user to import it anyways.

23

That makes sense - thanks for sharing your experience. I’ve passed that feedback on to the team.

24

I’m currently also facing the issue, I tried adding a few assets, but for most of them I got the LogFab: Error: Invalid Manifest then after restarting it switched to LogFab: Error: Invalid pack - either contains a uproject or a uplugin file but then the first error happened again.

How can I add these assets now or what do I need to do?

Also there should be at least an error message in the UI to show that something went wrong.

25

I’m dealing with the same thing on MacOS, I found mitmproxy (github) project that allows proxying the request, but yeah, I think you should be able to override it as a user, a warning makes sense, but manually having to install a mitmproxy to get this to work seems odd since you also can’t download the assets in the store or anywhere else!

26

Could you please share the URL(s) for the product(s) that you were attempting to access?

27

We are having trouble the same issue with these two:

Mongo Survival RPG Engine
https://www.fab.com/listings/e61323ca-e56e-45d6-ab54-a78356260459

MEGR Characters (Female Heroine 02)

https://www.fab.com/listings/e67d23af-078a-4b48-bf3e-459f8d71555c

The message is:

LogFab: Error: Invalid pack - either contains a uproject or a uplugin file

Platform is UE 5 on Windows 11.

28

We are wondering what we should do next. We have several hundred dollars invested in products that we can’t use because of this problem.

Is this something the vendor can fix? Should we demand a refund if it is not fixed?

Is there any way to download the package manually and import it into Unreal?

Thanks!

29

Did you figure out what to do? We are experiencing a similar issue with a purchased plugin.LogFab: Display: Base Url https://cloudflare.epicgamescdn.com/Builds/Rocket/Automated/EnginePlugins/BoundingBox2D/CloudDir,https://epicgames-download1.akamaized.net/Builds/Rocket/Automated/EnginePlugins/BoundingBox2D/CloudDir,https://download.epicgames.com/Builds/Rocket/Automated/EnginePlugins/BoundingBox2D/CloudDir,https://fastly-download.epicgames.com/Builds/Rocket/Automated/EnginePlugins/BoundingBox2D/CloudDir LogFab: Error: Invalid pack - either contains a uproject or a uplugin file