Thanks for your reply...
I have tried to compile and run without creating eclipse project but still I was having the exception. so what was the resolution for that ?
I think scala.tools.nsc is part of the Scala compiler, so maybe there's a conflict with your Scala/SBT versions and what Play is expecting. Also, I think Play includes its own local version of SBT, but you also have a version of SBT on your machine, so is it getting confused over which SBT to use?
I have only installed SBT and Scala 2.10 so I don't think there was a conflict between then and still if you think so what do i need to do.