Bukkit

What steps will reproduce the problem?
1.Enable WorldGuard region protection in plugin config
2.Attempt to /land claim or /land buy
3.error occurs

What is the expected output? What do you see instead?
It says an internal error occured

What version of the product are you using?
The latest

Do you have an error log of what happened?

18.04 00:26:59 [Server] INFO ... 15 more
18.04 00:26:59 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[Spigot183.jar:git-Spigot-26dfd01-5cb9b70]
18.04 00:26:59 [Server] INFO at com.jcdesimp.landlord.LandlordCommandExecutor.onCommand(LandlordCommandExecutor.java:60) ~[?:?]
18.04 00:26:59 [Server] INFO at com.jcdesimp.landlord.LandlordCommandExecutor.landlord_claim(LandlordCommandExecutor.java:274) ~[?:?]
18.04 00:26:59 [Server] INFO at com.jcdesimp.landlord.pluginHooks.WorldguardHandler.canClaim(WorldguardHandler.java:50) ~[?:?]
18.04 00:26:59 [Server] INFO Caused by: java.lang.NoSuchMethodError: com.sk89q.worldguard.protection.regions.ProtectedRegion.getIntersectingRegions(Ljava/util/Collection;)Ljava/util/List;

Please provide any additional information below.

When I turn the world guard function off, this plugin works again...

Can I ask what version of worldguard, Landlord, and spigot you are using?

Thank you.