Cant use command * ctrl-x

Im using X- Controller GBRL 1.1g Cant use command

  • ctrl-x
  • error:9
  • ctrl-x / ^X
  • error:9

Ive used it before but not sure how, any-ideas, also if there is a compiled list of commands exclusively for x-carve 1000 will be appreciated .
I want to move out from Easel.

Thanks

This is our write up on gcode, but it might not be exactly what you are looking for: https://inventables.zendesk.com/hc/en-us/articles/360012642474-Easel-G-code-Spec