Hello. In my last two projects made in the online editor, I see stubs instead of a preview of an electronic circuit or a printed circuit board (and oshwlab too). What am I doing wrong ? [https://oshwlab.com/hobbyele/guitar-shaped-audio-pcb-amplifier-smd](https://oshwlab.com/hobbyele/guitar-shaped-audio-pcb-amplifier-smd)