Wie behebe ich diesen Fehler

[LeckererNugget1]

[13:56:18 WARN]: [TTT] Task #4 for TTT v1.0 generated an exception
java.lang.NullPointerException
        at gameStates.IngameState.start(IngameState.java:27) ~[?:?]
        at gameStates.GameStateManager.setGameState(GameStateManager.java:26) ~[?:?]
        at countdowns.LobbyCountdown$1.run(LobbyCountdown.java:58) ~[?:?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:723) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot.jar:git-Spigot-db6de12-18fbb24]

[TileEntity]

In der Zeile 27 von der IngameState.class scheint etwas null zu sein - Also quasi ein Objekt/Variable ohne Inhalt