Mac Monterey - There was a problem sending data to the laser. The machine may be busy or paused

Hi !
I have an AtomStack A5 Pro and a MacBook Pro (Monterey 12.5.1).
Lightburn has recognized my laser machine but when attempting to click on Start to engraved a project I have this error message : There was a problem sending data to the laser.

The machine may be busy or paused…

I’ve already download CH340 driver but it’s not working.
I’ve tried with the 2 ports available on the dropdown menu on laser page : but nothing works.

Do you have any idea why it’s not working ?
Laser machine worked very well with another computer (not a Mac).
Thank you,

Christèle

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