QCARUnityPlayer error

Hi there, I am trying to build an android AR application using QualComm on Unity 3.3. When I try to build and run I get an error sayin "process.com.qualcomm.QCARUnityPlayer has stopped unexpectedly. Please try again."

This is my first time trying all this and i was wondering if i need to specify any build settings.

Please let me know if any of you have an idea on this.

Thanks