Bernina 430 sewing/embroidery machineWhen trying

Question

Bernina 430 sewing/embroidery machineWhen trying to set up and embroidery project. It is ready to stitch out, sent from computer no problem. When I go to hit the start button on the sewing machine a picture comes up on the screen, it looks like a stair step with an arrow above it. Nothing is shown in the manual as to what this means.