ASP.NET Error PRForms.dll

Hello,

I'm receiving an error "Could not load file or assembly 'PRForms.DLL' or one of its dependencies."  when referencing Sage.Peachtree.API  in an ASP.NET application.  However, the same code works as a console app.  How do I resolve this issue?  

.NET Framework 4.6.1

MVC 5.2.7

Running on Sage 50 US Server

SDK 2018.2.00.0197 

Thanks