Problem with Alarm 1

Hi, Just set up my Laser and downloaded Lightburn. Trying to print and the laser console keeps coming up with Alarm 1: Machine position is likely lost due to sudden and immediate halt. Re-homing is highly recommended.
Grbl 1.1h [ā€˜Sā€™ for help]

What does this mean, how do I re-home
Thanks in advance

Did you check this already?
https://docs.lightburnsoftware.com/Troubleshooting/GRBLErrors.html#alarm1

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