How to migrate TFS 2008 Project Version Control to TFS 2010?

I have Microsoft Team Foundation Server 2008 installed on my company since tree years. I installed TFS 2010 and I want to migrate the version control from 2008 to 2010. I tried to use Team Foundation Server Integration To开发者_高级运维ols (March 2011 Release) but I've got an error/conflict when I tried to migrate:

The target server http://tfs2008:8080/ is not a TFS2010 server

I don't know why it says target and not source even I've putted it (tfs 2008) on the left source!!

Can anyone any idea what's going on?

Thank you and Kind Regards.

I was able to migrate from the tfs 2008 server, I ran the TFS integration tool from 2008 and it worked.