Hi KrishKen,
In order to help you on the issue, please check on the following points.
1. Please capture a screenshot of the error message and post it here.
2. Please check whether the Users container exists in the AD. If not, please try recreating the Users container, the run the configuration wizard to check on the issue.
Also, I found a similar case in the forum which might help you out. You can click on the link below and check the reply posted by Adrian G Kruss.
http://community.office365.com/en-us/forums/613/t/59679.aspx
Thanks,
Yang Yu