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This is simple test of shadow by using a spotlight shader.
shadow map is getting rendered. No warning & no errors.
beauty.rib is getting rendered. but total blackout.
for the same scene I rendered shadowmap by using air and then render using pixie.
Got a warning about shadowmap but scene got rendered. Attached image.
There is one more problem. The sphere is not casting shadow on plane.
It seems like you're setting the "samples" parameter to 0 in your shader (maya_spotlight). This parameter must be set to something greater than zero, otherwise it will not look up the map.