Error!

[16:09:23 ERROR]: Could not pass event BlockPlaceEvent to ProtectionStones v1.9d

org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:427) ~[server.jar:git-Spigot-1204]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[server.jar:git-Spigot-1204]
        at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredLi
stener.java:30) ~[server.jar:git-Spigot-1204]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:482) [server.jar:git-Spigot-1204]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:467) [server.jar:git-Spigot-1204]
        at org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.callBlockPlace
Event(CraftEventFactory.java:114) [server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.ItemBlock.processBlockPlace(ItemBlock.ja
va:88) [server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.ItemBlock.interactWith(ItemBlock.java:72
) [server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.ItemStack.placeItem(ItemStack.java:78) [
server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.PlayerInteractManager.interact(PlayerInt
eractManager.java:391) [server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java
:626) [server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.PacketPlayInBlockPlace.a(SourceFile:60)
[server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.PacketPlayInBlockPlace.handle(SourceFile
:9) [server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:147
) [server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [serv
er.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:6
57) [server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
59) [server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
40) [server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:446) [server.jar:git-Spigot-1204]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [server.jar:git-Spigot-1204]
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to com.
sk89q.worldedit.Location
        at com.sk89q.worldguard.protection.flags.LocationFlag.marshal(LocationFl
ag.java:40) ~[?:?]
        at com.sk89q.worldguard.protection.databases.YAMLDatabase.addMarshalledF
lag(YAMLDatabase.java:280) ~[?:?]
        at com.sk89q.worldguard.protection.databases.YAMLDatabase.getFlagData(YA
MLDatabase.java:268) ~[?:?]
        at com.sk89q.worldguard.protection.databases.YAMLDatabase.save(YAMLDatab
ase.java:240) ~[?:?]
        at com.sk89q.worldguard.protection.databases.AbstractProtectionDatabase.
save(AbstractProtectionDatabase.java:43) ~[?:?]
        at com.sk89q.worldguard.protection.managers.RegionManager.save(RegionMan
ager.java:69) ~[?:?]
        at com.axeldios.ProtectionStones.ProtectionStonesBlockListener.onBlockPl
ace(ProtectionStonesBlockListener.java:306) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_45]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_45]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_45]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_45]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:425) ~[server.jar:git-Spigot-1204]
        ... 19 more