Error messages on my LaserWeb4 and Eleksmaker

I am having an issue with Laserweb’s lack of informative error messages. Just telling me " `` Warning: Gcode out of machine bounds, can lead to running work halt does not help find the error, especially when everything I check shows everything I know about is less than the 420 x 300 mm I have defined. The image is actually 170 x 61.
The other extremely informative message is " The file has minor issues. Please check document is correctly loaded!". Gee where shall I look to fix this?