Could not load file or assembly 'ASSEMBLY_NAME' or one of its dependencies. An attempt was made to load a program with an incorrect format.

The error occurred as transfer from 32-bit to 64-bit platforms. A solution is very easy:

1. Go to "ASSEMBLY_NAME" project in solution
2. Open project properties
3. Open "Build" tab
4. Change "Platform target" to "Any CPU"
5. Compile solutions.

Enjoy!