Bukkit

What steps will reproduce the problem?
1.Place a sign to sell a residence
2.Enter the necessary information
3.Press Done

What is the expected output? What do you see instead?
I got the following error in the console:
2013-05-20 14:25:19 [SEVERE] Could not pass event SignChangeEvent to ResidenceSigns v2.9
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
        at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:1364)
        at net.minecraft.server.v1_5_R3.Packet130UpdateSign.handle(SourceFile:46)
        at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292)
        at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:109)
        at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:581)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: 0
        at java.lang.String.charAt(Unknown Source)
        at brandenBoegh.ResidenceSigns.ResidenceSignsListener.onSignCreate(ResidenceSignsLi
stener.java:174)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
        ... 14 more

What version of the product are you using?
Bukkit: 1.5.2-R0.1 Built 02771
Residence: 2.6.6.4
ResidenceSigns: 2.9

Do you have an error log of what happened?
Look above

Please provide any additional information below.
I also tested it with the dev built of bukkit. I only got the error when i try to sell a residence. Buying or renting works perfectly. Also the german traslation file doesn't work.
The error when i try to use the german language file:

2013-05-20 14:03:48 [SEVERE] Error occurred while enabling ResidenceSigns v2.9 (Is it up to date?)
unacceptable character '?' (0xFFFD) special characters are not allowed
in "<reader>", position 122