When I try to open my project made by UE4.21, it failed to launch and show a bad image dialog, and the suggest is like this(sorry i can’t paste an image of it):
EngineFolder\UE4.21\Engine\Binaries\Win64\UE4Editor-Engine.dll is either not designed to run on windows or it contains an error. Blabla…
But i did run it on a x64 machine and the project was launch properly before. Now not only this project, all of my other projects cannot launch and they show the same error. What should I do and what cause this problem? Thank you.