BatchPreProcess Lum binned 1x1 + RGB binned 2x2 Fails

[jerrymacon]

When I run the BatchPreProcess with Lum binned 1x1 and RGB binned 2x2, I always get the error "Image calibration, No master calibration frames or overscan regions have been specified".
I have 1x1 bias and darks, and 1x1 and 2x2 flats.  What am I doing wrong here?

[MikeOates]

You seem to be missing the 2x2 bias and darks. The darks may not be needed, but the bias will be.

Mike