Bukkit

[19:26:04 WARN]: [MinecartMania] Task #36346 for MinecartMania v2.5 generated an
 exception
java.lang.NullPointerException
        at com.afforess.minecartmania.listeners.CoreListener$1.run(CoreListener.
java:249) ~[?:?]
        at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftTask.run(CraftTask.java
:58) ~[spigot.jar:git-Spigot-1487]
        at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftScheduler.mainThreadHea
rtbeat(CraftScheduler.java:345) [spigot.jar:git-Spigot-1487]
        at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:6
35) [spigot.jar:git-Spigot-1487]
        at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:2
83) [spigot.jar:git-Spigot-1487]
        at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:5
83) [spigot.jar:git-Spigot-1487]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java
:489) [spigot.jar:git-Spigot-1487]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:6
28) [spigot.jar:git-Spigot-1487]