Bukkit

What steps will reproduce the problem?
1. Configure Landlord: http://pastebin.com/mQV6rWxK
2. Issue a Landlord command (e.g. /ll info)

What is the expected output? What do you see instead?
Expected: command to function as normal
Actual: Receive error "An internal error has ocurred while attempting to perform this command" and the command does not produce the expected output. Commands such as /ll claim and /ll unclaim function as expected (except for producing any meaningful output), but still display the error message.

What version of the product are you using?
Landlord v1.3
Spigot craftbukkit-1.8.8-R0.1-SNAPSHOT
NO WorldGuard plugin installed
PermissionsEx-1.23.3
Essentials-2.x-SNAPSHOT
a few other plugins such as betteralias, killrewards, logblock, vault, etc.

Do you have an error log of what happened?
http://pastebin.com/sVQSFzeX

Please provide any additional information below.
Most of the tickets I have seen on here usually involve some sort of interference with WorldGuard, but I don't have that plugin installed.

As far as I can tell, this issue is actually related to the use of particle effects on the chunks in your code (e.g. for the info command, Effect.LAVADRIP is used). I see this error in the console:

Caused by: java.lang.NoSuchFieldError: LAVADRIP
        at com.jcdesimp.landlord.LandlordCommandExecutor.landlord_info(LandlordCommandExecutor.java:1046) ~[?:?]
        at com.jcdesimp.landlord.LandlordCommandExecutor.onCommand(LandlordCommandExecutor.java:103) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Bukkit-9a17f01]
        ... 15 more

And you have this in your Info.java:

            if(plugin.getConfig().getBoolean("options.particleEffects")){
                land.highlightLand(player, Effect.LAVADRIP);
            }

That's where the error is being thrown.

Is it possible to get a build of Landlord without particle effects enabled? In some places you use effects, you check for the options.particleEffects option, but in other places (like Unclaim.java) you don't.

Alternatively, could I submit a patch that checks for options.particleEffects every time a particle effect is used?

Landlord currently only supports Spigot, not craftbukkit. I would like to change this in the future but for now this is the case unfortunately.