Soundtrack Pro Quit Unexpectedly due to Hijack Server Plug-in

Soundtrack Pro is giving an error after upgrading to Mac OS X 10.5 Leopard. And it became unusable. The error I am receiving is:

The application soundtrack pro quit unexpectedly. The problem may have been caused by the Instant Hijack Server plug-in.
Mac OS X and other applications are not affected.
Click Relaunch to launch the application again. Click Report to see more details or send a report to Apple.
Ignore / Report / Relaunch
What I don't understand is that the cause of the error is from the Instant Hijack Server Plug-in. Where will I find it? Kindly please tell me the steps on resolving this. Thanks!
