Ichat3 error message camera in use by another application

when i try and open ichat3 the video will not preview it tells me the camera is in use by another application which as far as i can see its not anyone got any ideas, thanks

Your last email was returned with a technical Error
Copy here
Ok,
My misunderstanding about which one was not working.
Go to your Home Folder/Library/Preferences and delete com.apple.ichat.plist as this will hold on to references to iUSBCam
Also check there is no com.ecamm.iUSBCam.plist hanging about.
Also check these two folders
System/Library/Input managers
and Library/Input managers
You are looking for anything that says iUSBCam and also for SIMBL which is a folder and may have more iUSBCam things in it.
(I can't remember which folder it is exactly)
10:21 PM Saturday; February 28, 2009

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