For those who read code:
Description: Ticking entity
java.lang.NoSuchFieldError: defaultVolume
at gravisuite.ItemAdvancedJetPack.onArmorTick(ItemAdvancedJetPack.java:127)
at gravisuite.ItemAdvancedNanoChestPlate.onArmorTick(ItemAdvancedNanoChestPlate.java:69)
at...