Light Burn configuration problem with Ortur Laser Master 2

My Ortur LM2 works fine with GrbL, but when using LightBurn I get Busy 100%, and the program stops responding every time I try to start any burn, works fine when I design and so but when I press the start button , Ready turns to Busy, and it halts,

  1. I refreshed the firmware of the machine, reinstalled Light burn, chose the right configurations for the machine many times, and yet no result.
    thank you for your help

What job origins are you trying to use?
Absolute coordinates?
Running at mm/sec or mm/min?