# Missing DLL files and D3D11 Error

**URL:** <https://forums.unrealengine.com/t/missing-dll-files-and-d3d11-error/472138>\
**Category:** Platform & Builds\
**Tags:** windows-10, unreal-engine, dll-missing, UE4, question\
**Created:** [September 29, 2020, 4:22pm UTC](https://forums.unrealengine.com/t/missing-dll-files-and-d3d11-error/472138 "2020-09-29T16:22:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Zag0da](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Zag0da](https://forums.unrealengine.com/u/Zag0da)\
**Post date:** [September 29, 2020, 4:22pm UTC](https://forums.unrealengine.com/t/missing-dll-files-and-d3d11-error/472138/1 "2020-09-29T16:22:15Z")

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I have currently been working on a game project for near 2 months now, and never run into any bugs/errors that couldn’t be solved until this one.  
At this time, when I package the game (for windows 64-bit) it will go through the build process, and successfully create a build of the game. However, when I try to run it I get the following error

![316460-crash.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/d/7/0/d703091709bc06f336d40bd6f7855397d70fbfbd.png)

In addition to this, when I check the log file after the crash, I have this message at the top that are the only errors thrown in the entire log

> LogWindows: Failed to load ‘aqProf.dll’ (GetLastError=126)

> LogWindows: File ‘aqProf.dll’ does not exist

> LogWindows: Failed to load ‘VtuneApi.dll’ (GetLastError=126)

> LogWindows: File ‘VtuneApi.dll’ does not exist

> LogWindows: Failed to load ‘VtuneApi32e.dll’ (GetLastError=126)

> LogWindows: File ‘VtuneApi32e.dll’ does not exist

> LogConsoleResponse: Display: Failed to find resolution value strings in scalability ini. Falling back to default.

> LogD3D11RHI: Error: Result failed at D:/Build/++UE4/Sync/Engine/Source/Runtime/Windows/D3D11RHI/Private/D3D11Viewport.cpp:368 with error DXGI\_ERROR\_INVALID\_CALL

So far, I have completely uninstalled Unreal Engine and the Epic Games launcher and done a fresh install, I have repeated that and in addition deleted everything in **C:/Users/{system username}/AppData/Local/UnrealEngine** , I have also run Startup Repair, Chkdsk, scanned and repaired the drive, and nothing has seemed to work.

I am very close to reinstalling windows completely but would rather not do that.

Any help or insight would really be appreciated