Hello! I hope you are doing great!

I have noticed an issue with the "ItemStages-Forge-1.19.2-5.0.2" version of the mod
I understand it is still "alpha", I just wanted to report the issue!

The game launches fine with the mod, but I have noticed that if you have FTB Quests installed, and you try to open the quest book, a popup shows up on the top right saying "Error! Server doesn't have FTB quests"

With the mod removed from the mods folder, the quest book is accessible.

This sounds like an error with FTB Quests. This mod has no official support or integration with FTB Quests.