Flash Builder 4 not detecting code changes.

Question

I'm new to flash builder and am using FB4 now. I was doing some simple flex coding with the webcam...and then i made an error and the debugger displayed the error

TypeError: Error #1007: Instantiation attempted on a non-constructor. at Camera1/init()[H:\Flash\Flash Builder Workspace\Camera1\src\Camera1.as:35] at Camera1()[H:\Flash\Flash Builder Workspace\Camera1\src\Camera1.as:25]

Then i rectified the error and tried to launch it but its displaying the same error. ITs as if the old file is being kept in some history list or something. When i copy the code and create a new project and compile it it runs fine. I am stumped.

I am a newbie and i tried lots of things before seeking help.