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Hi Chris - seems to me that the error is happening due to to trying to to a colour calibration on a mono image. If you are shooting with the QHY8l OSC camera then all your subs should be colour, so perhaps in the RAW/FITS tab did you by chance change this to a mono setting? If indeed you are shooting in mono, then you need to do the "RGB combine" before any further colour processing so that you have a colour output to work on.
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