# Does anyone know what this error stack cause is?

**URL:** <https://forums.unrealengine.com/t/does-anyone-know-what-this-error-stack-cause-is/479758>\
**Category:** Rendering\
**Tags:** deployment, unreal-engine, packaging-projects, Rendering, question\
**Created:** [March 5, 2021, 2:17am UTC](https://forums.unrealengine.com/t/does-anyone-know-what-this-error-stack-cause-is/479758 "2021-03-05T02:17:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jyashi](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@jyashi](https://forums.unrealengine.com/u/jyashi)\
**Post date:** [March 5, 2021, 2:17am UTC](https://forums.unrealengine.com/t/does-anyone-know-what-this-error-stack-cause-is/479758/1 "2021-03-05T02:17:15Z")

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When i try to deploy on Android the materials of two of my static meshes revert to none and this error occures.

```
LogPlayLevel: Error: 03-05 00:22:24.145 8576 8691 D UE4 : [2021.03.04-15.22.24:145][0]LogAndroid: Error: === Critical error: ===
LogPlayLevel: Error: 03-05 00:22:24.145 8576 8691 D UE4 : [2021.03.04-15.22.24:145][0]LogAndroid: Error:
LogPlayLevel: Error: 03-05 00:22:24.145 8576 8691 D UE4 : [2021.03.04-15.22.24:145][0]LogAndroid: Error: Assertion failed: Data != __null [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/OpenGLDrv/Public/OpenGLResources.h] [Line: 658]
LogPlayLevel: Error: 03-05 00:22:24.145 8576 8691 D UE4 : [2021.03.04-15.22.24:145][0]LogAndroid: Error:
LogPlayLevel: Error: 03-05 00:22:24.145 8576 8691 D UE4 : [2021.03.04-15.22.24:145][0]LogAndroid: Error: [Callstack] 0x00000000B77B467C libUE4.so(0x000000000C20467C)!TOpenGLBuffer<FOpenGLBaseVertexBuffer, 34962u, &(CachedBindArrayBuffer(unsigned int))>::Lock(unsigned int, unsigned int, bool, bool) []
LogPlayLevel: Error: 03-05 00:22:24.145 8576 8691 D UE4 : [2021.03.04-15.22.24:145][0]LogAndroid: Error: [Callstack] 0x00000000B785772C libUE4.so(0x000000000C2A772C)![Unknown]() []
LogPlayLevel: Error: 03-05 00:22:24.145 8576 8691 D UE4 : [2021.03.04-15.22.24:145][0]LogAndroid: Error: [Callstack] 0x00000000B7856D78 libUE4.so(0x000000000C2A6D78)!FOpenGLDynamicRHI::LockVertexBuffer_BottomOfPipe(FRHICommandListImmediate&, FRHIVertexBuffer*, unsigned int, unsigned int, EResourceLockMode) []
LogPlayLevel: Error: 03-05 00:22:24.145 8576 8691 D UE4 : [2021.03.04-15.22.24:145][0]LogAndroid: Error: [Callstack] 0x00000000B389FA88 libUE4.so(0x00000000082EFA88)![Unknown]() []
LogPlayLevel: Error: 03-05 00:22:24.145 8576 8691 D UE4 : [2021.03.04-15.22.24:145][0]LogAndroid: Error: [Callstack] 0x00000000B383CBD4 libUE4.so(0x000000000828CBD4)!FRHICommandListExecutor::ExecuteInner_DoExecute(FRHICommandListBase&) []
LogPlayLevel: Error: 03-05 00:22:24.146 8576 8691 D UE4 : [2021.03.04-15.22.24:145][0]LogAndroid: Error: [Callstack] 0x00000000B389AE90 libUE4.so(0x00000000082EAE90)!FExecuteRHIThreadTask::DoTask(ENamedThreads::Type, TRefCountPtr<FGraphEvent> const&) []
LogPlayLevel: Error: 03-05 00:22:24.146 8576 8691 D UE4 : [2021.03.04-15.22.24:146][0]LogAndroid: Error: [Callstack] 0x00000000B389A550 libUE4.so(0x00000000082EA550)!TGraphTask<FExecuteRHIThreadTask>::ExecuteTask(TArray<FBaseGraphTask*, TSizedDefaultAllocator<32> >&, ENamedThreads::Type) []
LogPlayLevel: Error: 03-05 00:22:24.146 8576 8691 D UE4 : [2021.03.04-15.22.24:146][0]LogAndroid: Error: [Callstack] 0x00000000B20D1120 libUE4.so(0x0000000006B21120)!FNamedTaskThread::ProcessTasksNamedThread(int, bool) []
LogPlayLevel: Error: 03-05 00:22:24.146 8576 8691 D UE4 : [2021.03.04-15.22.24:146][0]LogAndroid: Error: [Callstack] 0x00000000B20CF658 libUE4.so(0x0000000006B1F658)!FNamedTaskThread::ProcessTasksUntilQuit(int) []
LogPlayLevel: Error: 03-05 00:22:24.146 8576 8691 D UE4 : [2021.03.04-15.22.24:146][0]LogAndroid: Error: [Callstack] 0x00000000B3927B60 libUE4.so(0x0000000008377B60)!FRHIThread::Run() []
LogPlayLevel: Error: 03-05 00:22:24.146 8576 8691 D UE4 : [2021.03.04-15.22.24:146][0]LogAndroid: Error: [Callstack] 0x00000000B21C5B08 libUE4.so(0x0000000006C15B08)!FRunnableThreadPThread::Run() []
LogPlayLevel: Error: 03-05 00:22:24.146 8576 8691 D UE4 : [2021.03.04-15.22.24:146][0]LogAndroid: Error: [Callstack] 0x00000000B20CA9D4 libUE4.so(0x0000000006B1A9D4)!FRunnableThreadPThread::_ThreadProc(void*) []
LogPlayLevel: Error: 03-05 00:22:24.146 8576 8691 D UE4 : [2021.03.04-15.22.24:146][0]LogAndroid: Error: [Callstack] 0x00000000E86C58F4 libc.so(0x00000000000808F4)![Unknown]() []
LogPlayLevel: Error: 03-05 00:22:24.146 8576 8691 D UE4 : [2021.03.04-15.22.24:146][0]LogAndroid: Error: [Callstack] 0x00000000E867ED64 libc.so(0x0000000000039D64)![Unknown]() []
LogPlayLevel: Error: 03-05 00:22:24.146 8576 8691 D UE4 : [2021.03.04-15.22.24:146][0]LogAndroid: Error:
LogPlayLevel: Error: 03-05 00:22:24.146 8576 8691 D UE4 : [2021.03.04-15.22.24:146][0]LogAndroid: Error:

```

Thoughts appreciated.

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<div class="post-metadata">

**Author:** ![fer1977](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@fer1977](https://forums.unrealengine.com/u/fer1977)\
**Post date:** [February 6, 2023, 9:27am UTC](https://forums.unrealengine.com/t/does-anyone-know-what-this-error-stack-cause-is/479758/2 "2023-02-06T09:27:27Z")

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Hello, I´m having the same issue recently I update my project to ue5.1 and my game crashes. Could you tell me if you could Fix the error. Thanks in advance.