Sony Ericsson

I am a huge fan of Sony Ericsson and recently purchased W580i from CellHut through the discount information available at http://www.dealrocker.com . Everything is working superbly fine, except the camera. Whenever I try to use the camera it says "Another application is running. Please close the application and then start the camera." Can't figure out the problem. Wondering what can I do to make it work properly?

Any help will be greatly appreciated.