Am getting error while tring to run Netbeans Platform application like

Error msg:
Result: 2
C:\Program Files\NetBeans 7.1\harness\suite.xml:498: The following error occurred while executing this line:
C:\Program Files\NetBeans 7.1\harness\run.xml:193: The application is already running within the test user directory.
You must shut it down before trying to run it again.
BUILD FAILED (total time: 7 seconds)

Help me to run the program correctly....