Editor crashes when opening metahuman blueprint

Development Character & Animation
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1

Whenever I try to open a metahuman blueprint, the editor crashes. Anyone know what’s wrong?

Assertion failed: Module [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Modules\ModuleManager.cpp] [Line: 388] MeshBoneReduction

UnrealEditor_Core!FModuleManager::LoadModuleChecked() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Modules\ModuleManager.cpp:388]
UnrealEditor_MeshUtilities!FMeshUtilities::RemoveBonesFromMesh() [D:\build++UE5\Sync\Engine\Source\Developer\MeshUtilities\Private\MeshUtilities.cpp:5151]
UnrealEditor_MeshBuilder!FSkeletalMeshBuilder::Build() [D:\build++UE5\Sync\Engine\Source\Developer\MeshBuilder\Private\SkeletalMeshBuilder.cpp:192]
UnrealEditor_MeshBuilder!FMeshBuilderModule::BuildSkeletalMesh() [D:\build++UE5\Sync\Engine\Source\Developer\MeshBuilder\Private\MeshBuilderModule.cpp:72]
UnrealEditor_Engine!FSkeletalMeshRenderData::Cache() [D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\SkeletalMeshRenderData.cpp:541]
UnrealEditor_Engine!USkeletalMesh::CacheDerivedData() [D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\SkeletalMesh.cpp:4614]
UnrealEditor_Engine!USkeletalMesh::ExecutePostLoadInternal() [D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\SkeletalMesh.cpp:3523]
UnrealEditor_Engine!FAsyncTask::DoWork() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\AsyncWork.h:303]
UnrealEditor_Engine!FAsyncTask::DoThreadedWork() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\AsyncWork.h:328]
UnrealEditor_Core!FQueuedThreadPoolWrapper::FScheduledWork::DoThreadedWork() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Misc\QueuedThreadPoolWrapper.cpp:21]
UnrealEditor_Core!FQueuedThreadPoolWrapper::FScheduledWork::DoThreadedWork() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Misc\QueuedThreadPoolWrapper.cpp:21]
UnrealEditor_Core!FQueuedThreadPoolWrapper::FScheduledWork::DoThreadedWork() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Misc\QueuedThreadPoolWrapper.cpp:21]
UnrealEditor_Core!<lambda_925f6c2453012060ddab4eb171196a20>::operator()() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\Task.h:333]
UnrealEditor_Core!LowLevelTasks::TTaskDelegate<void __cdecl(bool),48>::TTaskDelegateImpl<<lambda_925f6c2453012060ddab4eb171196a20>,0>::CallAndMove() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\TaskDelegate.h:171]
UnrealEditor_Core!LowLevelTasks::FTask::ExecuteTask() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\Task.h:426]
UnrealEditor_Core!LowLevelTasks::FScheduler::TryExecuteTaskFrom<&LowLevelTasks::TLocalQueueRegistry<1024>::TLocalQueue::DequeueGlobal,0>() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:280]
UnrealEditor_Core!LowLevelTasks::FScheduler::WorkerMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:320]
UnrealEditor_Core!UE::Core::Private::Function::TFunctionRefCaller<<lambda_776551d1e343b6cb7eaf0e5521c77c81>,void __cdecl(void)>::Call() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Templates\Function.h:549]
UnrealEditor_Core!FThreadImpl::Run() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\HAL\Thread.cpp:69]
UnrealEditor_Core!FRunnableThreadWin::Run() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:146]

2

I had to enable the “SkeletalReduction” plugin (called “Skeletal Mesh Simplifier (Early Access)” in the plugin window).

It is enabled by default, that’s probaby why not many people run into this.

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