System.BadImageFormatException An attempt was made to load a program with an incorrect format

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It’s possibly a 32 – 64 bits mismatch.

If you’re running on a 64-bit OS, the Assembly RevitAPI may be compiled as 32-bit and your process as 64-bit or “Any CPU”.

Or, the RevitAPI is compiled as 64-bit and your process is compiled as 32-bit or “Any CPU” and running on a 32-bit OS.

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