Description: Exception while ticking a block

java.lang.ClassCastException: axa cannot be cast to axl
at alp.b(SourceFile:42)
at ed.a(SourceFile:12)
at atl.b(SourceFile:113)
at atl.c(SourceFile:139)
at qi.a(SourceFile:498)
at qi.c(SourceFile:196)
at net.minecraft.server.MinecraftServer.x(SourceFile:578)
at net.minecraft.server.MinecraftServer.w(SourceFile:510)
at cui.w(SourceFile:132)
at net.minecraft.server.MinecraftServer.run(SourceFile:426)
at java.lang.Thread.run(Unknown Source)