This problem should be resolved as of version 4.0.10. If you are seeing this error, please delete the EfficionConsulting.Articles.dll from your bin directory.

This error is caused by having a single class defined in two places. Since the shift to the WSP model of development, we include the vb files that define the code behind as part of the install, ASP.NET then compiles these as needed. If the DLL is still in the bin directory, then the classes are being defined by both the .vb files and the .dll file.

Version 4.0.10 and greater have a file that will automatically delete the DLL on install of the module.