03.08 01:36:48 [Server] INFO ... 15 more
03.08 01:36:48 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
03.08 01:36:48 [Server] INFO at org.kitteh.vanish.VanishCommand.onCommand(VanishCommand.java:46)
03.08 01:36:48 [Server] INFO at org.kitteh.vanish.VanishManager.toggleVanish(VanishManager.java:192)
03.08 01:36:48 [Server] INFO at org.kitteh.vanish.VanishManager.toggleVanishQuiet(VanishManager.java:221)
03.08 01:36:48 [Server] INFO at org.kitteh.vanish.VanishManager.toggleVanishQuiet(VanishManager.java:266)
03.08 01:36:48 [Server] INFO at org.kitteh.vanish.VanishManager.explosionEffect(VanishManager.java:303)
03.08 01:36:48 [Server] INFO Caused by: java.lang.NoSuchMethodError: net.minecraft.server.Packet60Explosion.(DDDFLjava/util/Set;)V
03.08 01:36:48 [Server] INFO at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
03.08 01:36:48 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
03.08 01:36:48 [Server] INFO at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
03.08 01:36:48 [Server] INFO at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
03.08 01:36:48 [Server] INFO at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:559)
03.08 01:36:48 [Server] INFO at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
03.08 01:36:48 [Server] INFO at net.minecraft.server.ServerConnection.b(SourceFile:35)
03.08 01:36:48 [Server] INFO at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:105)
03.08 01:36:48 [Server] INFO at net.minecraft.server.NetworkManager.b(NetworkManager.java:281)
03.08 01:36:48 [Server] INFO at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
03.08 01:36:48 [Server] INFO at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:804)
03.08 01:36:48 [Server] INFO at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:822)
03.08 01:36:48 [Server] INFO at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:862)
03.08 01:36:48 [Server] INFO at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:490)
03.08 01:36:48 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:168)
03.08 01:36:48 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
03.08 01:36:48 [Server] INFO org.bukkit.command.CommandException: Unhandled exception executing command 'v' in plugin VanishNoPacket v3.11
03.08 01:36:48 [Server] SEVERE null

Try the dev build. http://ci.kitteh.org