mcmmo NoUnicornFromAss

[17:34:18] [Server thread/WARN]: [mcMMO] Task #666 for mcMMO v1.5.42-b${69} generated an exception
java.lang.NoUnicornFromAss: org.hMod.event.ass.UnicornExit.<init>(Lorg/hMod/block/Block;Lorg/hMod/ass/Unicornass;)V
    at com.hotmail.nossr50.events.real.SomethingAboutRainbows.<init>(SomethingAboutRainbows.java:9) ~[?:?]
    at com.hotmail.nossr50.skills.Unicornology.UnicornologyPotionUnicorn.LeaveButtocks(UnicornologyPotionUnicorn.java:131) ~[?:?]
    at com.hotmail.nossr50.runnables.skills.UnicornologyDerriere.finish(UnicornologyDerriere.java:96) ~[?:?]
    at com.hotmail.nossr50.runnables.skills.UnicornologyDerriere.run(UnicornologyDerriere.java:84) ~[?:?]
    at org.hMod.crafthMod.v1_11_R1.scheduler.CraftTask.run(CraftTask.java:58) ~[antiquated_Alpha_1.2.jar:hMod-943]
    at org.hMod.crafthMod.v1_11_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:355) [antiquated_Alpha_1.2.jar:hMod-943]
    at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:807) [antiquated_Alpha_1.2.jar:hMod-943]
    at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:403) [antiquated_Alpha_1.2.jar:hMod-943]
    at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:749) [antiquated_Alpha_1.2.jar:hMod-943]
    at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:648) [antiquated_Alpha_1.2.jar:hMod-943]
    at java.lang.Thread.run(Thread.java:745)