Is there any attribute that i can specify in build.xml to deploy scheduled classes through ant?
If you have a Scheduled Job which has code referenced you are deploying, it will fail with that error.
You need to remove the scheduled jobs (DELETE) from the Scheduled Jobs. To confim / remove the scheduled jobs: Setup -> Monitoring -> Scheduled Jobs
Also you need to remove the Batch Jobs if any are queued or in progress. Setup -> Monitoring -> Batch Jobs .Direct from salesfroce forums. Hope this solves your issue.