Packaging error of Unreal Engine project

Question

kamarsto 2025-6-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2177444-packaging-error-of-unreal-engine-project

评论： Nishan Nekoo 2025-6-4

I am trying to package Unreal Engine project with the Mathworks plugin. I cannot accomplish this even with otherwise empty project. I get this error: PackagingResults: Error: Unknown Error

Packaging (Windows): [1/3] Compile [x64] CompileTest.cpp
Packaging (Windows): [2/3] Link [x64] CompileTest.exe
Packaging (Windows): Module.MathWorksSimulation.5.cpp.obj : error LNK2005: Symbol "void __cdecl StdFree(void *)" is already defined in CompileTest.cpp.obj
Packaging (Windows): Module.MathWorksSimulation.5.cpp.obj : error LNK2005: Symbol "void * __cdecl StdMalloc(unsigned __int64, unsigned __int64)" is already defined in CompileTest.cpp.obj
Packaging (Windows): Module.MathWorksSimulation.5.cpp.obj : error LNK2005: Symbol "void * __cdecl StdRealloc(void *, unsigned __int64, unsigned __int64)" is already defined in CompileTest.cpp.obj
Packaging (Windows): Creating library CompileTest.lib and export CompileTest.exp
Packaging (Windows): fatal error LNK1169: one or more multiply defined symbols found

I have removed user specific paths from the error message.

I am also getting these warnings about missing directories, which I wasn't able to resolve. The folders seem to exist in different places than expected.

Packaging (Windows): Referenced directory 'C:\Program Files\Epic Games\UE_5.3\Engine\Source\MathWorksSimulation' does not exist.
Packaging (Windows): MATLABROOT_RAYTRACING environment variable appears unset; defaulting to MATLABROOT
Packaging (Windows): MATLABROOT (MathWorksRaytracing): C:\Program Files\MATLAB\R2024b
Packaging (Windows): Referenced directory 'C:\Program Files\MATLAB\R2024b\toolbox\shared\ray_intersect\export\include' does not exist.
Packaging (Windows): Referenced directory 'C:\Program Files\MATLAB\R2024b\toolbox\shared\ray_path_geometry\export\include' does not exist.
Packaging (Windows): Referenced directory 'C:\Program Files\MATLAB\R2024b\toolbox\shared\sensorsim_core\export\include' does not exist.
Packaging (Windows): MATLABROOT (MathWorksSimulation): C:\Program Files\MATLAB\R2024b
PackagingResults: Warning: Referenced directory 'C:\Program Files\Epic Games\UE_5.3\Engine\Source\MathWorksSimulation' does not exist.
PackagingResults: Warning: Referenced directory 'C:\Program Files\MATLAB\R2024b\toolbox\shared\ray_intersect\export\include' does not exist.
PackagingResults: Warning: Referenced directory 'C:\Program Files\MATLAB\R2024b\toolbox\shared\ray_path_geometry\export\include' does not exist.
PackagingResults: Warning: Referenced directory 'C:\Program Files\MATLAB\R2024b\toolbox\shared\sensorsim_core\export\include' does not exist.
Packaging (Windows): Referenced directory 'C:\Program Files\Epic Games\UE_5.3\Engine\Source\MathWorksSimulation' does not exist.
Packaging (Windows): Writing manifest to C:\Users\User\Documents\SKA\analysis\unrealexperiments\CompileTest\Intermediate\Build\Manifest.xml
Packaging (Windows): Building CompileTest...
Packaging (Windows): Using Visual Studio 2022 14.36.32548 toolchain (C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532) and Windows 10.0.26100.0 SDK (C:\Program Files (x86)\Windows Kits\10).
PackagingResults: Warning: Referenced directory 'C:\Program Files\Epic Games\UE_5.3\Engine\Source\MathWorksSimulation' does not exist.

How do I resolve these issues?

In the editor everything works as expected, the game runs

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Answer 1

Nishan Nekoo 2025-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/2177444-packaging-error-of-unreal-engine-project#answer_1565763

Hi kamarsto,

I just wanted to make sure you have followed all the instructions on this page when creating the executable? https://www.mathworks.com/help/sl3d/package-custom-scenes-into-executable.html

There might be specific instructions there that could help avoid these errors. Let me know if you are still running into issues after reviewing that page.

Nishan

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Nishan Nekoo 2025-6-2

Sorry to hear that reinstaling hasn't seemed to work so far.

Usually plugins are downloaded in the ProgramData folder by default when you download the support package: C:\ProgramData\MATLAB\SupportPackages\R2024b\toolbox\shared\sim3dprojects\spkg\plugins

For co-simulating with the Unreal Editor, the instructions ask to use the sim3d.utils.copyExampleSim3dProject function to copy these plugins into the correct Unreal Engine installation directory (C:\Program Files\Epic Games\UE_5.3\Engine\Plugins\Marketplace\Mathworks)and create a sample project.

You might have already done this, but just to make sure:

Delete old plugins in ProgramData path above
Download fresh support package (for R2024b)
Delete "Mathworks" folder under Plugins/Marketplace
Run copyexampleSim3dProjects to plugins

It might be good to verify that the plugins are all indeed in this directory: C:\Program Files\Epic Games\UE_5.3\Engine\Plugins\Marketplace\Mathworks

Hopefully the above helps. I'm looking into this a bit more in parallel, but if I don't have a solution for you, please reach out to support@mathworks.com to get additional support here. I apologize this hasn't been straightforward for you.

Nishan

kamarsto 2025-6-3

在 MATLAB Online 中打开

After adding the mentioned lines to the Target file I managed to get a different set of errors when packaging or cooking. I did not have the toolboxes connected with driving installed, but installing them did not resolve it.

UATHelper: Cooking (Windows): LogInit: Display: LogProperty: Error: FStructProperty::Serialize Loading: Property 'StructProperty /MathWorksSimulation/Landscape/Roads/GeneratorUsage/SplineMeshImport.SplineMeshImport_C:UserConstructionScript:CallFunc_GetDataTableRowFromName_OutRow'. Unknown structure.
UATHelper: Cooking (Windows): LogInit: Display: LogBlueprint: Error: [Compiler] In use pin  Road Import Struct  no longer exists on node  Break <unknown struct> . Please refresh node or break links to remove pin. from Source: /MathWorksSimulation/Landscape/Roads/GeneratorUsage/SplineMeshImport.SplineMeshImport
UATHelper: Cooking (Windows): LogInit: Display: LogBlueprint: Error: [Compiler] In use pin  X  no longer exists on node  Break <unknown struct> . Please refresh node or break links to remove pin. from Source: /MathWorksSimulation/Landscape/Roads/GeneratorUsage/SplineMeshImport.SplineMeshImport
UATHelper: Cooking (Windows): LogInit: Display: LogBlueprint: Error: [Compiler] In use pin  Y  no longer exists on node  Break <unknown struct> . Please refresh node or break links to remove pin. from Source: /MathWorksSimulation/Landscape/Roads/GeneratorUsage/SplineMeshImport.SplineMeshImport
UATHelper: Cooking (Windows): LogInit: Display: LogBlueprint: Error: [Compiler] In use pin  Z  no longer exists on node  Break <unknown struct> . Please refresh node or break links to remove pin. from Source: /MathWorksSimulation/Landscape/Roads/GeneratorUsage/SplineMeshImport.SplineMeshImport
UATHelper: Cooking (Windows): LogInit: Display: LogBlueprint: Error: [Compiler] No Struct in  Break <unknown struct> from Source: /MathWorksSimulation/Landscape/Roads/GeneratorUsage/SplineMeshImport.SplineMeshImport
UATHelper: Cooking (Windows): LogInit: Display: LogProperty: Error: FStructProperty::Serialize Loading: Property 'StructProperty /MathWorksSimulation/Landscape/Roads/GeneratorUsage/RoadImport.RoadImport_C:AreTablesEqual:CallFunc_GetDataTableRowFromName_OutRow'. Unknown structure.
UATHelper: Cooking (Windows): LogInit: Display: LogProperty: Error: FStructProperty::Serialize Loading: Property 'StructProperty /MathWorksSimulation/Landscape/Roads/GeneratorUsage/RoadImport.RoadImport_C:AreTablesEqual:CallFunc_GetDataTableRowFromName_OutRow_1'. Unknown structure.
UATHelper: Cooking (Windows): LogInit: Display: LogProperty: Error: FStructProperty::Serialize Loading: Property 'StructProperty /MathWorksSimulation/Landscape/Roads/GeneratorUsage/RoadImport.RoadImport_C:Refresh:CallFunc_GetDataTableRowFromName_OutRow'. Unknown structure.
UATHelper: Cooking (Windows): LogInit: Display: LogBlueprint: Error: [Compiler] In use pin  Road Import Struct  no longer exists on node  Break <unknown struct> . Please refresh node or break links to remove pin. from Source: /MathWorksSimulation/Landscape/Roads/GeneratorUsage/RoadImport.RoadImport
UATHelper: Cooking (Windows): LogInit: Display: LogBlueprint: Error: [Compiler] In use pin  X  no longer exists on node  Break <unknown struct> . Please refresh node or break links to remove pin. from Source: /MathWorksSimulation/Landscape/Roads/GeneratorUsage/RoadImport.RoadImport
UATHelper: Cooking (Windows): LogInit: Display: LogBlueprint: Error: [Compiler] In use pin  Y  no longer exists on node  Break <unknown struct> . Please refresh node or break links to remove pin. from Source: /MathWorksSimulation/Landscape/Roads/GeneratorUsage/RoadImport.RoadImport
UATHelper: Cooking (Windows): LogInit: Display: LogBlueprint: Error: [Compiler] In use pin  Z  no longer exists on node  Break <unknown struct> . Please refresh node or break links to remove pin. from Source: /MathWorksSimulation/Landscape/Roads/GeneratorUsage/RoadImport.RoadImport
UATHelper: Cooking (Windows): LogInit: Display: LogBlueprint: Error: [Compiler] No Struct in  Break <unknown struct> from Source: /MathWorksSimulation/Landscape/Roads/GeneratorUsage/RoadImport.RoadImport
UATHelper: Cooking (Windows): LogInit: Display: LogCook: Warning: 'ProjectSettings -> PackagingSettings -> Directories to always cook' has invalid element '/DatasmithRuntime/Materials'
UATHelper: Cooking (Windows): LogInit: Display: LogCook: Warning: 'ProjectSettings -> Directories to never cook -> Directories to always cook' has invalid element '/DatasmithRuntime/Materials'
UATHelper: Cooking (Windows): LogInit: Display: LogUObjectGlobals: Warning: [AssetLog] C:\Program Files\Epic Games\UE_5.3\Engine\Plugins\Marketplace\MathWorks\MathWorksSimulation\Content\Characters\Bob\Mesh\SM_Bob.uasset: Failed to load '/Game/Environment/Characters/Humans/Bob/Material/_Body_Low': Can't find file.
UATHelper: Cooking (Windows): LogInit: Display: LogLinker: Warning: [AssetLog] C:\Program Files\Epic Games\UE_5.3\Engine\Plugins\Marketplace\MathWorks\MathWorksSimulation\Content\Characters\Bob\Mesh\SM_Bob.uasset: VerifyImport: Failed to load package for import object 'Package /Game/Environment/Characters/Humans/Bob/Material/_Body_Low'
UATHelper: Cooking (Windows): LogInit: Display: LogUObjectGlobals: Warning: [AssetLog] C:\Program Files\Epic Games\UE_5.3\Engine\Plugins\Marketplace\MathWorks\MathWorksSimulation\Content\Landscape\Roads\GeneratorUsage\SplineMeshImport.uasset: Failed to load '/Game/Environment/Industrial/Road/Build/RoadImportStruct': Can't find file.
UATHelper: Cooking (Windows): LogInit: Display: LogLinker: Warning: [AssetLog] C:\Program Files\Epic Games\UE_5.3\Engine\Plugins\Marketplace\MathWorks\MathWorksSimulation\Content\Landscape\Roads\GeneratorUsage\SplineMeshImport.uasset: VerifyImport: Failed to load package for import object 'Package /Game/Environment/Industrial/Road/Build/RoadImportStruct'
UATHelper: Cooking (Windows): LogInit: Display: LogUObjectGlobals: Warning: [AssetLog] C:\Program Files\Epic Games\UE_5.3\Engine\Plugins\Marketplace\MathWorks\MathWorksSimulation\Content\Landscape\Roads\GeneratorUsage\MarkerMaterial.uasset: Failed to load '/Game/Environment/Industrial/Road/FourLaneRoad/Textures/T_FourLaneRoad_N_2': Can't find file.
UATHelper: Cooking (Windows): LogInit: Display: LogLinker: Warning: [AssetLog] C:\Program Files\Epic Games\UE_5.3\Engine\Plugins\Marketplace\MathWorks\MathWorksSimulation\Content\Landscape\Roads\GeneratorUsage\MarkerMaterial.uasset: VerifyImport: Failed to load package for import object 'Package /Game/Environment/Industrial/Road/FourLaneRoad/Textures/T_FourLaneRoad_N_2'
UATHelper: Cooking (Windows): LogInit: Display: LogMaterial: Warning: [AssetLog] C:\Program Files\Epic Games\UE_5.3\Engine\Plugins\Marketplace\MathWorks\MathWorksSimulation\Content\Landscape\Roads\GeneratorUsage\MarkerMaterial.uasset: Failed to compile Material for platform PCD3D_SM6, Default Material will be used in game.
UATHelper: Cooking (Windows):  (Node TextureSampleParameter2D) Param2D> Found NULL, requires Texture2D

kamarsto 2025-6-4

Yes, it is visible and has content

Nishan Nekoo 2025-6-4

Can you try packaging an executable with the untouched example project? This might help narrow down if there are any issues with your project, or whether your environment is not set up correctly. If this doesn't help you narrow down the issue, I'd recommend reaching out to support@mathworks.com and providing your project and output log so that the support team can investigate further.

Apologies that I couldn't help resolve your issue here.

Nishan

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Packaging error of Unreal Engine project

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Packaging error of Unreal Engine project

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