Error 20 Unsuported or invalid G-code

One of my steppers had a bad connection on the white wire, causing irregular shapes. This I repaired however now I find I have an error 20. Unsupported or invalid G-Code command on or near line 2. Job halted stream completed in 0.00. I can cut a square which completes but laser does not return to it’s origin, When attempting to cut a circle it cuts about 2 degrees of the arc then stops. And when I cut a hexagon only 5 sides are cut. Most odd? All 3 operations return the same error 20. I have tried another Eleksmaker 5.2 and still have the same results. The machine has been working perfectly for several months, Is my software corrupted ??

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