Thanks.
The dimensions of the FITS file (as reported) seem to be strange, and judging by the 2nd WARNING message (which is garbled due to a bug, but I can see where it is coming from), there is something strange about the WCS in the FITS file.
I'm happy to take a look at it in more detail if you are able to make the FITS file available. How big is it? You can email me download details if you are able to make it available on a website or similar.
If you're not able to do that, are you able to show the FITS header here so I can see what we are working with?