Cannot create play 2 project

Hi

I just downloaded IntelliJ  14.0.3 build 139.1117 and would like to use Scala related features.  I can create Scala and SBT project without any problem. But when I tried to "Play 2.x" project, ti always pop up "sbt project name must be a valid scala identifier" even if  the project name is perfectly valid. (please see the screenshot)

This issue happened on both Mac and Windows platform.  Any suggestions?

thanks

Frank