Hello!
Please send me the logs. To do it, enable developer tools, open Terminal application, type sailjail -p harbour-saildiscord.desktop /usr/bin/harbour-saildiscord >> ~/sdslog.txt 2>&1. After that wait for newly opened Sailcord app to appear and close it once the error is displayed, finally in terminal click Ctrl+C, wait a few seconds and close it. Then send me a newly created file located in your home folder called sdslog.txt. If you are uncomfortable to send it here, you can send it me in PMs, my telegram group or discord server.