[00:50:07 WARN]: [UltimateStacker] Task #558 for UltimateStacker v1.10.8 generat
ed an exception
java.lang.NullPointerException
[00:50:07 WARN]: Could not grab flags from WorldGuard
java.lang.IllegalArgumentException: java.lang.ClassCastException@60be1af
        at sun.reflect.GeneratedMethodAccessor72.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.8.0_221]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_221]
        at com.songoda.ultimatestacker.core.hooks.worldguard.WorldGuardFlagHandl
er.getBooleanFlagLegacy(WorldGuardFlagHandler.java:255) [ultimatestacker-1.10.8.
jar:?]
        at com.songoda.ultimatestacker.core.hooks.worldguard.WorldGuardFlagHandl
er.getBooleanFlag(WorldGuardFlagHandler.java:175) [ultimatestacker-1.10.8.jar:?]

        at com.songoda.ultimatestacker.core.hooks.WorldGuardHook.getBooleanFlag(
WorldGuardHook.java:51) [ultimatestacker-1.10.8.jar:?]
        at com.songoda.ultimatestacker.tasks.StackingTask.processEntity(Stacking
Task.java:219) [ultimatestacker-1.10.8.jar:?]
        at com.songoda.ultimatestacker.tasks.StackingTask.run(StackingTask.java:
71) [ultimatestacker-1.10.8.jar:?]
        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.mainThreadHea
rtbeat(CraftScheduler.java:350) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:7
23) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:3
74) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:6
54) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java
:557) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]
[00:50:07 WARN]: [UltimateStacker] Task #558 for UltimateStacker v1.10.8 generat
ed an exception
java.lang.NullPointerException