I have this dnn app working pefectly on my development machine. But then I uploaded the files to the server and tried to get eveything as much the same as possible. I got this error when I tried to run it on line: 

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: BC30175: class 'Controller' and class 'Controller', declared in 'C:\WINDOWS\Microsoft.NET\Framework\V2.0.50727\Temporary ASP.NET Files\root\98511e73\eb493bab\App_SubCode_IFrame.g1uxq2kj.10.vb', conflict in namespace 'IFrame'.

Source Error:

Line 27:     ''' IFrame Module controller.
Line 28:     ''' </summary>
Line 29:     Public Class Controller
Line 30:         Implements IPortable
Line 31:

Thanks for the tip.

The problem was that my FTP program, instead of overwriting the files, it was making a duplicate by adding _old to the file.

This is what was causing the conflict: files with the same code but different names.

Hope this helps anyone else who may encounter the same problem.

The IFrame project was changed from WAP to WSP type in it's latest release. Therefore, you shouldn't have any Iframe DLLs in your installation's Bin directory. In WSP, the code files are not compiled into a DLL at all. If you are getting other errors, please supply some more details and I'll be happy to look into it.