[ERROR] [1464153153.330383554]: VIDIOC_S_FMT error 22, Invalid argument

I am using a nikon dslr camera as a webcam in ROS.But when i am running this command rosparam set usb_cam/pixel_format mjpeg i am getting this error [ERROR] [1464153153.330383554]: VIDIOC_S_FMT error 22, Invalid argument can you please tell me the cause of this error or the solution?