I really need help on this because I lost my hopes to correct the problem.
I am using Office Communications Server 64bit libraries. There are 3 dlls I use in the pro
In my case i got this issue because i was running a web project compiled for x64 using IISExpress. I fixed the issue by checking the following setting in Visual Studio:
Tools | Options | Projects and Solutions | Web Projects | Use the 64 bit version of IIS Express
Hope this helps anyone else with this same scenario and issue