Could not load file or assembly 'Interop.MicroPoint_IP_RealTime'

I have ERROR below when running the project in Debug (in Release it works normally):

  An unhandled exception of type 'System.IO.FileNotFoundException'   occurred in Slim.exe

     

Additional information: Could not load file or assembly   'Interop.MicroPoint_IP_RealTime, Version = 1.0.0.0, Culture = neutral,   PublicKeyToken = null 'or one of its dependencies. The system can not   find the specified file.

Can you help me?