Mythic mobs isn't working (Yes, I checked FAQ, downloaded mythiclib

Hello! Please help me as my Mythic Mobs isn't working, I've done everything required but still doesnt work, I run spigot 1.8.8.
04.11 01:45:21 [Multicraft] Loaded config for "Spigot 1.8.8 Build #45" 04.11 01:45:22 [Multicraft] Updating eula.txt file 04.11 01:45:22 [Server] INFO Loading libraries, please wait... 04.11 01:45:26 [Server] INFO Starting minecraft server version 1.8.8 04.11 01:45:26 [Server] INFO Loading properties 04.11 01:45:26 [Server] INFO Default game type: SURVIVAL 04.11...

Mythic mobs isn't working (Yes, I checked FAQ, downloaded mythiclib