I try making my own mod pack..

I start creating a quest book , adding 2 simple quest ...

When i clic on the exit button the game crash with this error :

The game crashed whilst unexpected error
Error: java.lang.NoSuchMethodError: betterquesting.api.questing.IQuestDatabase.getEntries()[Lbetterquesting/api2/storage/DBEntry;

i can load the save anymore until a delete de betterquest folder.

Better-questing-3.5.317
questbook-3.1.1-1.12
rfexpension-3.4.31
StandardExpansion-3.4.171

damn, I also have the same problem in a modpack I'm making... wait a minute, what if you make THREE quests?

I likely forgot to update something in RF expansion

I have had this exact same error. I have so far determined that it only happens when you have more than one quest. Hope this helps!

I also do not have any RF mods installed