failure of cheese with a Microsoft LifeCam NX-6000

[peter@easthope.ca]

Any insights about these messages when cheese fails?

guest@imager:~$ cheese

(cheese:1572): Gtk-WARNING **: Theme parsing error: cheese.css:7:35: 
  The style property GtkScrollbar:min-slider-length is deprecated and 
  shouldn't be used anymore. It will be removed in a future version

(cheese:1572): cheese-WARNING **: Device '/dev/video0' cannot capture 
  in the specified format: gstv4l2object.c(3583): 
  gst_v4l2_object_set_format_full (): 
  /GstCameraBin:camerabin/GstWrapperCameraBinSrc:camera_source/GstBin:bin28/GstV4l2Src:v4l2src1:
Tried to capture in BGR3, but device returned format MPEG

(cheese:1572): Cogl-WARNING **: driver/gl/cogl-pipeline-opengl.c:932: 
GL error (1280): Invalid enumeration value

What is a "Theme parsing error"?
Is there a simple fix for the format problem?  
What is meant by 'Invalid enumeration value"?

Thanks,                     ... Peter E.

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