The modpack script is looking for the Quest Book item, but the mod failed to load or is missing.
| Error | Likely Cause | Solution | |-------|--------------|----------| | java.lang.NoClassDefFoundError | Missing dependency | Install required libraries (check mod description). | | Mod 'questbook' requires version 1.12-14.23.5.2768 of Forge | Wrong Forge version | Update Forge to the recommended build for 1.12.2. | | Black screen at launch | Conflict with another mod | Remove half your mods, test, repeat (binary search). | | Quest book GUI doesn’t open | Keybind conflict | Go to Controls → QuestBook → set a new key (default: B or H ). | | exp-net2 specific crashes | Network handler mismatch | Likely only works on a specific server; use in singleplayer may fail. | questbook-3.1.exp-net2-1.12.jar download
After downloading the QuestBook 3.1 Exp-Net2-1.12.jar file, follow these steps to install and set up the mod: The modpack script is looking for the Quest