BadImageFormatException and valid Win32

I have a C# application that runs well on my work laptop. However, the same application cannot run on my home laptop, I get an error saying: System.BadImageFormatException HResult=0x800700C1 Message=Could not load file or assembly 'xxx.dll' or one of its dependencies. is not a valid Win32 application. (Exception from HRESULT: 0x800700C1)

Both are Windows 10, both Visual Studio 2017 and have also the same configurations. What might be the issue and solve it?

Make sure 'xxx.dll' and all of its dependencies is the same as your OS architecture(x86/x64). Use dependency walker to find out the dependant modules.