picam

pi@raspberrypi ~ $ python picam.py
mmal: mmal_vc_component_create: failed to create component 'vc.ril.camera' (1:ENOMEM)
mmal: mmal_component_create_core: could not create component 'vc.ril.camera' (1)
mmal: Failed to create camera component
mmal: main: Failed to create camera component
mmal: Camera is not detected. Please check carefully the camera module is installed correctly

Traceback (most recent call last):
  File "picam.py", line 109, in <module>
    image1, buffer1 = captureTestImage(cameraSettings, testWidth, testHeight)
  File "picam.py", line 77, in captureTestImage
    imageData.write(subprocess.check_output(command, shell=True))
  File "/usr/lib/python2.7/subprocess.py", line 544, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command 'raspistill  -w 100 -h 75 -t 200 -e bmp -n -o -' returned non-zero exit status 70