Problems exporting to dxf or stl

I’m in sketchup make and I want to export a simple box to jscut but it won’t work. I’ve tried to export a file to meshcam with no luck. went through all the setting and still no luck.

Can anyone change my luck?

SketchUp Pro has DXF exporting capability. There’s SketchUp STL in the Extension Warehouse for STL exports.

Thanks, I’ll look for it.