Transfer Failed Machine may be busy or paused

I just downloaded Lightburn yesterday and today while using it with my Omtech Polar, I realized I’d made a mistake, so I paused, then stopped a print. Now I cannot send anything to the laser. I’m receiving a message that says, “Transfer Failed, there was a problem sending data to the laser. The machine may be busy or paused.”
I’m using the latest version 1.3.01. I’ve tried restarting the software, the laser and the computer.

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