https://pastebin.com/HjyTQNmw

Happens in a dev environment

1.7.6 for 1.11.2 uses snapshot_20161220 mappings. The switch to stable_32 mappings is committed but not published. You have to do either of the following:

1. Use snapshot_20161220 or some compatible mapping in your dev environment.
2. Build your own version of LLibrary with updated mappings and depend on it.
3. Get an official build out. It seems there are no changes to release at the moment, though.

1.7.7 has updated to stable_32