WordPress MU

Hello All,

Yesterday I download that and start using that. I tried to apply new themes on that and getting success but when I logged out from admin side and when I clicked on "CREATE A BLOG" then a new page opened with 2 fields named as "USERNAME" and "EMAIL".

this form rejected my email id each time and displaying same msg each time. even I tried to create a/c with diff email ids but each time same msg "check ur email id".

Please help me, and tell me, why I am getting this error and how can I resolve this.

Thanks & Regards
Dexterous