hi,
the game crash when we have the newest Version of the Guidebook in the mod folder. Please fix this in the next update.

Please provide a crash log. I can't fix it if you don't show me a crash log.

Oh one thing: if you use the recommended build of forge, it will not work. it has to be forge 2779 or newer, latest would be ideal since it has the most fixes.

Got same bug after updating my 84 mods. I have the log.
crash-2019-05-08_18.40.59-client.txt

Huh... what the heck happened. Seems the jar I uploaded was a development build rather than a proper build. I wonder how I managed that mixup... Welp 2.9.1 incoming!

v2.9.1 is approved on CurseForge. This release should fix that crash. @SoupOfDepression

https://minecraft.curseforge.com/projects/guidebook/files/2708746

I don't know if it will fix the original issue since I never saw a crash log for it, but I will assume so. If I'm wrong, let me know and i'll reopen.