Custom modpack,
crash-2022-02-19_23.12.31-client (1).txt

I am getting a similar crash in java.lang.NoClassDefFoundError: landmaster/plustic/modifiers/armor/JetpackPancakeHippos

From a previous issue:

#43 setting "Add Simply Jetpacks as ConArm modifiers" to false seems to fix it.

However my config seems to reset back to having this true when I try to launch.

Okay third time is the charm for saving the config it seems haha. Finally got a successful launch with this config change. Maybe this should be false by default or if there is some deeper cause that needs investigated for why this crash is happening. I was running into this adding the mod to Project Ozone 3 3.4.6

A fixed build is now available on CF.