Alarm 2 Falcon2

That means you’re trying to send the laser beyond the boundaries of the laser.

Follow these steps and you should never get that message:

Home your laser
After homing, never move the laser head by hand, use the jogging controls exclusively
Use Absolute Coords as the “Start from” mode in Laser window
Don’t ignore any warnings from LightBurn
Once you’re familiar with the function of your laser and LightBurn you can start experimenting with the other “Start from” modes to understand how they work, when they’re useful, and what considerations need to be made to use them.