ChunkDownLoader Error

Development Programming & Scripting
,
1

I am trying to use ChunkDownloader. So I followed the contents of Unreal’s official documentation, but when I run it after the editor and build, both errors appear.

In the case of the editor, the following error appears

LogChunkDownloader: Error: Unable to mount chunk 0 (no FCoreDelegates::MountPak bound)
LogChunkDownloader: Error: Chunk 0 mount failed.

In the log text file after building, the following error message appears

LogChunkDownloader: Chunk 0 mount requested(3 pak sequence).
LogIoDispatcher: Display: Reading toc: .. / .. / .. / PatchTest / Saved / PersistentDownloadDir / PakCache / pakchunk0 - Windows_0_P.utoc
LogIoDispatcher: Display: Mounting container '../../../PatchTest/Saved/PersistentDownloadDir/PakCache/pakchunk0-Windows_0_P.utoc' in location slot 0
LogPakFile: Display: Mounted IoStore container "../../../PatchTest/Saved/PersistentDownloadDir/PakCache/pakchunk0-Windows_0_P.utoc"
LogPakFile: Display: Mounted Pak file '../../../PatchTest/Saved/PersistentDownloadDir/PakCache/pakchunk0-Windows_0_P.pak', mount point: '../../../'
LogPakFile: Warning: Failed to mount pak "../../../PatchTest/Saved/PersistentDownloadDir/PakCache/pakchunk0-Windows_0_P.ucas", pak is invalid.
LogPakFile: Warning: Failed to mount pak "D:/UnrealProject/PatchTest/Build/Windows/PatchTest/Saved/PersistentDownloadDir/PakCache/pakchunk0-Windows_0_P.ucas", pak is invalid.
LogChunkDownloader: Error: Unable to mount.. / .. / .. / PatchTest / Saved / PersistentDownloadDir / PakCache / pakchunk0 - Windows_0_P.ucas from chunk 0(mount operation failed)
LogPakFile: Warning: Failed to mount pak "../../../PatchTest/Saved/PersistentDownloadDir/PakCache/pakchunk0-Windows_0_P.utoc", pak is invalid.
LogPakFile: Warning: Failed to mount pak "D:/UnrealProject/PatchTest/Build/Windows/PatchTest/Saved/PersistentDownloadDir/PakCache/pakchunk0-Windows_0_P.utoc", pak is invalid.
LogChunkDownloader: Error: Unable to mount.. / .. / .. / PatchTest / Saved / PersistentDownloadDir / PakCache / pakchunk0 - Windows_0_P.utoc from chunk 0(mount operation failed)
LogChunkDownloader: Error: Chunk 0 mount failed.

If anyone has solved this problem, I’d appreciate it if you could teach me how.

2

IO Store format is a new feature for packaging the assets. It seems there are couple of bugs in some conditions. you can disable it on Project setting > Packaging > Use IO store and your problem will be fixed. single .pak works fine.

3

Did you ever get around this issue? It seems like I need IO Store on for lumen and nanite but hitting the same errors. It does seem to load the pak fine and the content looks right.