I have moved this to your own thread so you can get the focus of the community on it.
Open the Console window in LightBurn.
Select the small switch on the right hand side of the Console window that says, “Show all”
Attempt the Job that produces the error.
When the error message arrives, select and copy the text from the Console window into a reply here.
En cualquier caso, he desinstaladlo la versión 1.2.04 y he instalado la 1.0.02 y ha desaparecido ese poblema. Mi problema con la versión 1.0.02 es que no me reconoce el R3 Pro Rotary Roller.
Gracias por su respuesta
In any case, I have uninstalled version 1.2.04 and installed 1.0.02 and that problem has disappeared. My problem with version 1.0.02 is that the R3 Pro Rotary Roller doesn’t recognize me.
Thanks for your reply
If you were willing to attempt 1.2.04 again, I would invite you to save your gcode file for inspection. Error at or on line zero can be caused by selecting iLaser instead of GRBL in the Laser window. This selection adjusts the gcode correctly for the iLaser but it can generate this error on other devices.
Please copy the Error 20 message you are getting from your Console window along with a few lines on each side so we might help with this. Also, if you are willing and interested in attaching a g-code file into a reply here that would be helpful and very interesting.