When i run my solution it gives a runtime error :

The type 'YAF.ForumPageBase' is ambiguous .it could come from assembly 'C:\Users\MAYANK\Desktop\DREAMJEE 6.0\DreamJEE\bin\pp.DLL' or from assembly 'C:\Users\MAYANK\Desktop\DREAMJEE 6.0\DreamJEE\bin\YAF.DLL'. Please specify the assembly explicitly in the type name.

i have tried to run the application while excluding those two dll files , cleared ASP.NET temporary files and folders and most of the techniques given on the internet but it didn't helped .

Pls Help me to fix this issue