@nautilus-avalon when did you last time update your HWS Creative Scenario??
Are you running the LATEST version?
https://github.com/B-iggy/HWS-Creative-Scenario
Your log file says clearly no.
04-12:50:01.985 13_50 -EXC- System.Exception: Model missing for block 224
this block is the firework block, which I added 2 days ago.
You must ALWAYS use the latest version or bad things like that happen.
https://forum.empyrion-homeworld.net/t/hws-creative-scenario-configs-ews/9161/169?u=rexxxus
Everyone: this is important. We will NOT support such cases in the future! You have to make sure you update your Scenario and ideally restart whole Empyrion before joining the HWS servers.
the underlying bug, that something seems to be cached and broken has to be fixed by Eleon.