UE 5.3 crashes after upgrading

[jappie_k]

When upgrading my project I can’t open some of the blueprints including my BP_ThirdPersonCharacter and Basegamestate.

Please help me I’ve been stuck on this for days.

The error code I got:

Assertion failed: FixupChunk.Header.NumHierachyFixups <= ( 1 << 8) [File:D:\build++UE5\Sync\Engine\Source\Developer\NaniteBuilder\Private\NaniteEncode.cpp] [Line: 2289]

UnrealEditor_NaniteBuilder
UnrealEditor_NaniteBuilder
UnrealEditor_GeometryCollectionEngine
UnrealEditor_GeometryCollectionEngine
UnrealEditor_GeometryCollectionEngine
UnrealEditor_DerivedDataCache
UnrealEditor_DerivedDataCache
UnrealEditor_DerivedDataCache
UnrealEditor_DerivedDataCache
UnrealEditor_GeometryCollectionEngine
UnrealEditor_GeometryCollectionEngine
UnrealEditor_GeometryCollectionEngine
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_ContentBrowserAssetDataSource
UnrealEditor_ContentBrowserAssetDataSource
UnrealEditor_ContentBrowserAssetDataSource
UnrealEditor_ContentBrowserAssetDataSource
UnrealEditor_ContentBrowser
UnrealEditor_ContentBrowser
UnrealEditor_ContentBrowser
UnrealEditor_ContentBrowser
UnrealEditor_ContentBrowser
UnrealEditor_ContentBrowser
UnrealEditor_ContentBrowser
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
user32
user32
UnrealEditor_ApplicationCore
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

[ATomCZ1]

If you will install Editor symbol do debugging, this errors logs will be much more detailed and helpful.

For example I’m getting this crash for example every time I open OldWestLearning project in UE 5.3

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffef20

UnrealEditor_NaniteBuilder!libmetis__CreateCoarseGraphNoMask()
UnrealEditor_NaniteBuilder!libmetis__Match_RM()
UnrealEditor_NaniteBuilder!libmetis__CoarsenGraph()
UnrealEditor_NaniteBuilder!libmetis__MultilevelBisect()
UnrealEditor_NaniteBuilder!libmetis__MlevelRecursiveBisection()
UnrealEditor_NaniteBuilder!METIS_PartGraphRecursive()
UnrealEditor_NaniteBuilder!FGraphPartitioner::BisectGraph() [D:\build\++UE5\Sync\Engine\Source\Developer\NaniteBuilder\Private\GraphPartitioner.cpp:181]
UnrealEditor_NaniteBuilder!FGraphPartitioner::RecursiveBisectGraph() [D:\build\++UE5\Sync\Engine\Source\Developer\NaniteBuilder\Private\GraphPartitioner.cpp:273]
UnrealEditor_NaniteBuilder!FGraphPartitioner::PartitionStrict() [D:\build\++UE5\Sync\Engine\Source\Developer\NaniteBuilder\Private\GraphPartitioner.cpp:382]
UnrealEditor_NaniteBuilder!Nanite::FCluster::Split() [D:\build\++UE5\Sync\Engine\Source\Developer\NaniteBuilder\Private\Cluster.cpp:549]
UnrealEditor_NaniteBuilder!Nanite::DAGReduce() [D:\build\++UE5\Sync\Engine\Source\Developer\NaniteBuilder\Private\ClusterDAG.cpp:373]
UnrealEditor_NaniteBuilder!`Nanite::BuildDAG'::`4'::<lambda_5>::operator()() [D:\build\++UE5\Sync\Engine\Source\Developer\NaniteBuilder\Private\ClusterDAG.cpp:283]
UnrealEditor_NaniteBuilder!`ParallelForImpl::ParallelForInternal<TFunctionRef<void __cdecl(int)>,`ParallelFor'::`2'::<lambda_1>,std::nullptr_t>'::`2'::FParallelExecutor::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\ParallelFor.h:116]
UnrealEditor_NaniteBuilder!ParallelForImpl::ParallelForInternal<TFunctionRef<void __cdecl(int)>,`ParallelFor'::`2'::<lambda_1>,std::nullptr_t>() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\ParallelFor.h:411]
UnrealEditor_NaniteBuilder!Nanite::BuildDAG() [D:\build\++UE5\Sync\Engine\Source\Developer\NaniteBuilder\Private\ClusterDAG.cpp:266]
UnrealEditor_NaniteBuilder!Nanite::FBuilderModule::Build() [D:\build\++UE5\Sync\Engine\Source\Developer\NaniteBuilder\Private\NaniteBuilder.cpp:614]
UnrealEditor_MeshBuilder!BuildNanite() [D:\build\++UE5\Sync\Engine\Source\Developer\MeshBuilder\Private\StaticMeshBuilder.cpp:255]
UnrealEditor_MeshBuilder!FStaticMeshBuilder::Build() [D:\build\++UE5\Sync\Engine\Source\Developer\MeshBuilder\Private\StaticMeshBuilder.cpp:436]
UnrealEditor_MeshBuilder!FMeshBuilderModule::BuildMesh() [D:\build\++UE5\Sync\Engine\Source\Developer\MeshBuilder\Private\MeshBuilderModule.cpp:50]
UnrealEditor_Engine!FStaticMeshRenderData::Cache() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\StaticMesh.cpp:3110]
UnrealEditor_Engine!UStaticMesh::CacheDerivedData() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\StaticMesh.cpp:5450]
UnrealEditor_Engine!UStaticMesh::ExecutePostLoadInternal() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\StaticMesh.cpp:6161]
UnrealEditor_Engine!FAsyncTask<FStaticMeshAsyncBuildWorker>::DoTaskWork() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\AsyncWork.h:626]
UnrealEditor_Engine!FAsyncTaskBase::DoWork() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\AsyncWork.h:289]
UnrealEditor_Engine!FAsyncTaskBase::DoThreadedWork() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\AsyncWork.h:313]
UnrealEditor_Core!FQueuedThreadPoolWrapper::FScheduledWork::DoThreadedWork() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Misc\QueuedThreadPoolWrapper.h:141]
UnrealEditor_Engine!FQueuedThreadPoolWrapper::FScheduledWork::DoThreadedWork() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Misc\QueuedThreadPoolWrapper.h:141]
UnrealEditor!`LowLevelTasks::FTask::Init<`FQueuedLowLevelThreadPool::AddQueuedWork'::`2'::<lambda_1> >'::`11'::<lambda_1>::operator()() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\Fundamental\Task.h:499]
UnrealEditor!LowLevelTasks::TTaskDelegate<LowLevelTasks::FTask * __cdecl(bool),48>::TTaskDelegateImpl<`LowLevelTasks::FTask::Init<`FQueuedLowLevelThreadPool::AddQueuedWork'::`2'::<lambda_1> >'::`11'::<lambda_1>,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:627]
UnrealEditor_Core!LowLevelTasks::FScheduler::ExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:172]
UnrealEditor_Core!LowLevelTasks::FScheduler::TryExecuteTaskFrom<LowLevelTasks::TLocalQueueRegistry<1024>::TLocalQueue,&LowLevelTasks::TLocalQueueRegistry<1024>::TLocalQueue::DequeueGlobal,0>() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:350]
UnrealEditor_Core!LowLevelTasks::FScheduler::WorkerMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\Fundamental\Scheduler.cpp:378]
UnrealEditor_Core!UE::Core::Private::Function::TFunctionRefCaller<`LowLevelTasks::FScheduler::CreateWorker'::`2'::<lambda_1>,void __cdecl(void)>::Call() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Templates\Function.h:480]
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:149]

I found the same stack trace i n different project

New adaptivity Segfault after last libMesh update

It looks like a problem in libmetis library and it is even fixed already.
Hard to tell how to use new version in UE.