[mariner10 (Steve)]

Hi people,
Can I ask for some advice please for all those imagers that use Pixinsight to process?
I’ve just started the processing process on a second image after completing my first one.
I'm right at the start of the process doing image integration.
As I'm a little slack I'm using the same calibration files (darks, bias and flats) as I did on the first image (without any issues) and I got the following error message on the second image:

ImageCalibration: Global context

Loading master calibration frames:
Loading calibration frame image:
C:/Users/User/Pictures/QHY8L/Master Calibration Files/superbias.fit
Reading FITS image: 32-bit floating point, 1 channel(s), 3328x2030 pixels: done
Normalizing sample values: done
40 FITS keywords extracted
Loading calibration frame image:
C:/Users/User/Pictures/QHY8L/Master Calibration Files/Master Dark.fit
Reading FITS image: 32-bit floating point, 1 channel(s), 3328x2030 pixels: done
Normalizing sample values: done
29 FITS keywords extracted
Loading calibration frame image:
C:/Users/User/Pictures/QHY8L/Master Calibration Files/Master Flat.fit
Reading FITS image: 32-bit floating point, 1 channel(s), 3328x2030 pixels: done
Normalizing sample values: done
35 FITS keywords extracted

Applying bias correction: master dark frame ...

Dark frame optimization thresholds:
Td0 = 0.00000000 (189 px = 0.003%)
*** Warning: The dark frame optimization threshold is probably too high (channel 0).
Computing master flat scaling factors ...
*** Error: Zero or insignificant scaling factor for flat frame channel# 0. (empty master flat frame image?)
<* failed*>

As I used the files on the first image with no issue I’m perplexed as to why I would be getting an error message now.
I tried doing another calibration of a flat file and using that instead of my original one and that too came up with the same error message.
Any hints or help would be appreciated.
Cheers.