sony ericsson cell phone problem?

i'm using a sony ericsson cell phone. today when i tried to use the camera, it said "Another application is running. Close it, and then start the camera." But i wasnt using any applications! And i didnt see any other applications that was running! i tried to turn off my cell and turn it on again but it still said the same thing. So what happened? whats that application? By the way, when i turned on the phone, the 'Moblie Backup Application' appeared itself, is it the problem? i closed it but i still couldn't use the camera. Somebody help me plz!!! thnx!!!!!!
 
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