UGS 2.0.7 SNAPSHOT driving GRBL gives error20 when sending T1M6

[tkms002]

My UGS running computer died so I had to get a new computer and had to load the latest UGS on it.
My CNC router machine runs GRBL 1.1.
I think I have all the modifications applied to the new UGS that I had to my old UGS.
The machine moves and the probe module is working.
When I try to run a GCode file I get the following error.
{ERROR} An error was detected while sending 'T1M6'. (error:20)
The version I was running before must have just ignored this as all my gcode files have it in.
Am I missing something or do I need to change something?
Thanks

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[tkms002]

Well I resorted to setting up Fusion to stop generating those commands and all is well. Probably should have done that in the first place.