PySide module import error: DLL load failed: %1 is not a valid Win32 application

Development Pipeline & Plugins Editor Scripting
2

I just pip installed PySide under the unreal engine installed python.


C:\Program Files\Epic Games\UE_4.21\Engine\Source\ThirdParty\Python\Win64>python -m pip install --upgrade pip
C:\Program Files\Epic Games\UE_4.21\Engine\Source\ThirdParty\Python\Win64>python -m pip install PySide