this means the CFA pattern is not stored in the fits header of your images. sometimes capture programs will write this info to the fits header, but the capture program would need to be told what kind of sensor you are using.
instead of "auto", you can set Debayer to the pattern mode that corresponds to the 6200C sensor. that info should be readily available from the sensor manufacturer. the only thing to watch out for is if your capture software writes the FITS files out in the same order as PI is set to read them in. you can control this with the format hints "up-bottom" and "bottom-up" or you can permanently set the fits reader direction in the fits file handler (tab on the left; double click the FITS line in the list to configure.)