Minecraft 1.19
Forge 41.0.94+
supermartijn642configlib-1.1.6b-forge-mc1.19
supermartijn642corelib-1.0.19-forge-mc1.19
portabletanks-1.1.5-forge-mc1.19

java.lang.NoClassDefFoundError: net/minecraftforge/forge/event/lifecycle/GatherDataEvent

crashlog

¦D

I updated everything to Forge 41.0.94 now in e6524af. Up to @Dremoline to release an update.

Fixed now in Portable Tanks 1.1.5a for 1.19.
Thank you for reporting the issue!