Hydra plugin added to another dll project in c#

I tried to add a hydra plugin in another dll project in c#. The project builds but, if the “Register for COM port” (in visual studio 2015) is checked, I get these errors:

“Severity Code Description Project File Line Suppression State
Error The assembly “C:\Users\rakib\Desktop\DesignCalcs_tmp\DesignCalcs\bin\Release\DesignCalcs.dll” could not be converted to a type library. Type library exporter encountered an error while processing ‘DesignCalcs.SwAddin, DesignCalcs’. Error: Error loading type library/DLL. DesignCalcs

Severity Code Description Project File Line Suppression State
Error The assembly ‘RemObjects.Hydra, Version=4.0.83.1133, Culture=neutral, PublicKeyToken=3df3cad1b7aa5098’ is not registered for COM Interop. Please register it with regasm.exe /tlb. DesignCalcs”

While Hydra relies on COM internally to perform cross-platform calls it doesn’t require plugin assemblies to be registered as COM components.Please uncheck the “Register for COM interop” option or consider moving Hydra plugin code into a separate assembly.