There are other users who have been banned from Stack Exchange sites. My problem is different. I just logged into Programmers, and I haven't asked or commented anything before within Programmers. When I tried clicking Ask Question I got the following response:
Sorry, we are no longer accepting questions from this account. See the Help Center to learn more.
I can ask questions in Stack Overflow as well as here. Now what would be the reason? If that is a mistake any way to revert it?