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Computer crashed after delete blueprint class drived from C++

I am learning UE4 programming follow the tutorial to here link text, But UE4 crashed while I try to edit a floor. Fatal error: [File:D:\Build\++UE4+Release-4.15+Compile\Sync\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11Util.cpp] [Line: 181] Unreal Engine is exiting due to D3D device being lost. (Error: 0x887A0007 - 'RESET')

To find the bug,I deleted blueprints drived from C++,but UE4 crashed more frequently.at last computer crashed.

Product Version: UE 4.17
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asked Sep 12 '17 at 09:08 AM in C++ Programming

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flyingc007
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