Topwisdom message says "Other Type File"

Good afternoon. New to Lightburn. After setting up the software and sending a file to the laser. this is a message I get on the dispaly. Other type file and laser head just moves to the corner then stops. has anybody encountered this? what is the solution. thanks

How did you send the file to the laser?

Good afternoon via USB
cable connected to the laser and PC

Let me ask it differently…

What did you do in Lightburn to send the file to the laser?