Unsupported or invalid g code

LightBurn Software Questions
1

im getting a error message when starting stream ==

[MSG:ERR: Bad GCode: M4]

error:20

Unsupported or invalid g-code command found in block.

On or near line 5:

[MSG:ERR: Unsupported GCode command]

On or near line 5:

Job halted. any help or insight would be greatly appreciated,

100mmTest.lbrn2 (13.4 KB)

2

Read here the answer:

Check your GRBL settings by typing $$ into Console Window.