Error with Interop DLL in IIS

I've created a Web Api with Visual Studio 2015 in C#, when I deploy this application with VS in Debug mode, all the calls works fine.

The problem comes when I deploy the application with IIS, and It try to use a method which converts an image from jbg to jpg using a Interop.reaconverter.dll (https://www.reaconverter.com/features/dll.html) I receive the following error:

"Retrieving the COM class factory for component with CLSID {F2D4F4E5-EEA1-46FF-A83B-A270C92DAE4B} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))"

Why it's not working with IIS? What can I do?

Thank you.