(Crash on startup)

minecraft 1.11.2
Forge 1.11.2-13.20.0.2296
DarkUtilities-1.11.2-1.2.0.134
crash-2017-05-22_16.47.32-client.txt

Bookshelf 2.x.x.x is a complete rewrite, and breaks compatibility with mods that depend on it. Please use the last 1.x.x.x version until a 2.x.x.x version of bookshelf has been marked as a full release, and not just an alpha.