Bukkit

What steps will reproduce the problem?
1.start the server
2.
3.

What is the expected output? What do you see instead?
plugin should load without errors as it used to, now i get the below error

What version of the product are you using?
3.1.4

Do you have an error log of what happened?

2011-10-22 14:11:52 [INFO] [xWarp]: 80 warps loaded
2011-10-22 14:11:52 [INFO] [xWarp]: 1 warp protection areas loaded
2011-10-22 14:11:52 [WARNING] [xWarp]: Skiped disabled permissions system: Permissions v2.7.7
2011-10-22 14:11:52 [INFO] [xWarp]: No permissions system found until here. A permissions plugin will be maybe activated later.
2011-10-22 14:11:52 [SEVERE] Error occurred while enabling xWarp v3.1.4 (Is it up to date?): Expecting non-static method com.nijikokun.register.payment.Methods.hasMethod()Z
java.lang.IncompatibleClassChangeError: Expecting non-static method com.nijikokun.register.payment.Methods.hasMethod()Z
    at de.xzise.wrappers.economy.EconomyHandler.customLoad(EconomyHandler.java:165)
    at de.xzise.wrappers.Handler.load(Handler.java:88)
    at de.xzise.wrappers.Handler.load(Handler.java:59)
    at de.xzise.xwarp.XWarp.onEnable(XWarp.java:131)
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:174)
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:957)
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:280)
    at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:171)
    at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:154)
    at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:297)
    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:284)
    at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:152)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:348)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)

Please provide any additional information below.
The plugin was working fine, came back online the next day and everybody was complaining that warps were broken.  /warp anywarp returns with
"you do not have permission to warp to "anywarp"

/warp help works as well as /xwarp but nobody is able to warp including ops and admins with * permissions

Which version of Bukkit Plugin Utilities are you using?

Fabian