I posted before about the error of getting BadImageFormatException and how it was associated to the processor settings. The fixed suggested were for Visual Studio only and in recent times I have now started working with Jet Brains Rider, which I then got the same issue, but found the correcting process.
If you do have Visual Studio and have this issue then you can read how to correct it on this post. BadImageFormatException When Running 32/64 Bit Applications in Visual studio
If you are using Jet Brains Rider then you can follow this instead.
- Open up your .Net Framework Project in Jet Brains Rider
- Select ‘Edit Configuration’ from the top right menu:

- Within the new window that opens you can then change the IIS Express path, which currently you can see is using the ‘x86’ version that is 32 bit. Update the path without this to configure the 64 bit version.
