2013-05-09 18:45:48 [SEVERE] Could not pass event PlayerJoinEvent to Vault v1.2.25-b320
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at net.minecraft.server.v1_5_R3.PlayerList.c(PlayerList.java:204)
at net.minecraft.server.v1_5_R3.PlayerList.a(PlayerList.java:100)
at net.minecraft.server.v1_5_R3.PendingConnection.d(PendingConnection.java:129)
at net.minecraft.server.v1_5_R3.PendingConnection.c(PendingConnection.java:44)
at net.minecraft.server.v1_5_R3.DedicatedServerConnectionThread.a(DedicatedServerConnectionThread.java:41)
at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:29)
at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:581)
at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NoClassDefFoundError: de/bananaco/bpermissions/api/CalculableType
at net.milkbowl.vault.permission.plugins.Permission_bPermissions2.playerHas(Permission_bPermissions2.java:119)
at net.milkbowl.vault.permission.plugins.Permission_bPermissions2.has(Permission_bPermissions2.java:95)
at net.milkbowl.vault.Vault$VaultListener.onPlayerJoin(Vault.java:529)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
... 14 more

I use the last bukkit dev, and this is with all versions of Vault

My server can not run without Vault, and I lose a lots of players :(
I change my bukkit version (2771) and i i haveI tested with the 3 latest version of vault
PS: I'm french, sorry for the bad english ^^

Looks like you're using an old version of bPermissions or they've changed the API. Make sure you have the most recent version of bpermissions and if the issue persists report it back to them.