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Ah yes that famous error message. I have seen it many times, way too many times that is!
First you need to know accurately your image scale. You can use the free Wodaski CCD image scale calculator from New Astronomy Press.
You also need to set your camera up well. I found my Proline 16803 worked well with 2x2 binning, 5 second exposures and luminance filter.
But my Trius 694 often did not do well. I think it often did not get enough stars. Also if the moon is bright you may get that error as there are not enough bright stars in the image. But when it did work I used 10 second exposures 1x1 binning.
The other thing to set is the north angle. What I do is if that image scale finder does not work I take an image in CCDsoft, save it then click on research astronometric (something or other). It usually works and gives me the north position angle. You have to tell it your image scale though.
Now I put that in the Sky X and it usually works.
It could also mean your polar alignment is off and the image you took is a fair way off the coordinates in the Sky X where it should be. So I think you need a rough polar alignment done first.
Greg.
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