Modpack version
1.30

Can the issue be reproduced?
Yes

Logs
https://pastebin.com/HBuBYP6m

Issue
Have been playing skyblock for a while. Just made an electric Jetpack and put it on and recently made a iron backpack and game has crashed repeatedly - have restarted a number of times and world loads but immediately crashed.

If this is a feature request, feel free to delete the template.

Delete the options.txt file :)