Error while running application

Can I request you to build your project first and then run? It seems to be that you have changed but not built it. Ensure that there is no duplicate DLLs (same assembly with different name) in the same location.

Also, put proper Subject messages..

You are more likely to get help if you put the error message in the question, not just the zip file. Try to make a clear and concise explanation of the problem in the question that members can read without having to download the zip file.