Error when importing a vrm 1.0 file to UE5 with vrm4u, after having it exported in Blender.

[beepboobbeep]

Describe the bug

I can directly import a unmodified 1.0 file to ue with no error. However, when importing it first to Blender and then exporting it, the ue importer will throw an error.
Log:
"LogVRM4ULoader: GetVRMMeta:std::stringFileName=㩃唯敳獲䐯癡摩慇業杮䐯獥瑫灯㌯⽤潤⁡档牡⽡牶⽭慤楬桡瘮浲
LogVRM4ULoader: GetVRMMeta: filesize=18345432
LogVRM4ULoader: GetVRMMeta: mScenePtr=0000000000000000
LogSlate: Window 'VRM Import Options' being destroyed
LogVRM4ULoader: VRM:(0.016 secs) ReadFileFromMemory
LogVRM4ULoader: Warning: VRM4U: read failure.
LogUObjectHash: Compacting FUObjectHashTables data took 0.38ms
LogSlate: Window 'Message' being destroyed
Message dialog closed, result: Ok, title: Message, text: Failed to import 'C:/Users/Gaming/Desktop/3d/doa chara/vrm/daliah.vrm'. Failed to create asset '/Game/NewFolder1/daliah'.
Please see Output Log for details.
LogAssetTools: Warning: Failed to import 'C:/Users/Gaming/Desktop/3d/doa chara/vrm/daliah.vrm'. Failed to create asset '/Game/NewFolder1/daliah'.
Please see Output Log for details.
LogAutomationController: Ignoring very large delta of 5.22 seconds in calls to FAutomationControllerManager::Tick() and not penalizing unresponsive tests
LogSlate: Took 0.000737 seconds to synchronously load lazily loaded font '../../../Engine/Content/Slate/Fonts/DroidSansFallback.ttf' (3848K)
LogSlate: Last resort fallback font was requested. Font: '../../../Engine/Content/Slate/Fonts/DroidSansFallback.ttf', Character: '㩃 (U+3a43)'
LogSlate: Took 0.001227 seconds to synchronously load lazily loaded font '../../../Engine/Content/SlateDebug/Fonts/LastResort.ttf' (5269K)"

To Reproduce

Import 1.0 vrm file to Blender
Export vrm 1.0 file
Import it to ue5, error

Expected behavior

After importing it, there should be files generated in ue.
It works without problems with 0.0 files.

Desktop (please complete the following information)

Win10 Prof.
Blender 4.02, also tested on Blender 3.6.7
Addon version 22032
Unreal Engine 5.3
VRM4U 20240212

[saturday06]

Thank you for the report. I'll investigate. Is your Unreal Engine version 5.3.2?

[beepboobbeep]

Yes, I have the version 5.3.2.

[saturday06]

Now, when I made VRM4U read the official VRM 1.0 sample model ( https://github.com/vrm-c/vrm-specification/blob/master/samples/VRMC_materials_mtoon_UV_Animation_Test/vrm/VRMC_materials_mtoon_UV_Animation_Test.vrm ), the same error as yours occurred. (Windows 11, Unreal Engine 5.3.2, VRM4U_5_3_20240212.zip)

I think this is probably a bug in VRM4U, so please file a bug report for VRM4U.