2012-04-23 00:09:41 [SEVERE] Error occurred while enabling Vault v1.2.15-b172 (Is it up to date?)
java.lang.NoSuchMethodError: in.mDev.MiracleM4n.mChatSuite.mChatSuite.getReader()Lin/mDev/MiracleM4n/mChatSuite/api/Reader;
at net.milkbowl.vault.chat.plugins.Chat_mChatSuite.(Chat_mChatSuite.java:54)
at net.milkbowl.vault.Vault.loadChat(Vault.java:165)
at net.milkbowl.vault.Vault.onEnable(Vault.java:109)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:215)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:336)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:250)
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:232)
at org.bukkit.craftbukkit.CraftServer.(CraftServer.java:184)
at net.minecraft.server.ServerConfigurationManager.(ServerConfigurationManager.java:53)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:156)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:422)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
2012-04-23 00:09:41 [WARNING] Failed to load ban list: java.io.FileNotFoundException: banned-players.txt (No such file or directory)
2012-04-23 00:09:41 [WARNING] Failed to load ip ban list: java.io.FileNotFoundException: banned-ips.txt (No such file or directory)
2012-04-23 00:09:41 [WARNING] Failed to load white-list: java.io.FileNotFoundException: white-list.txt (No such file or directory)

im not sure if this will help

2012-04-23 00:10:03 [INFO] [mChatSuite] Enabling mChatSuite v1.2.4-b199jnks-R1
2012-04-23 00:10:03 [INFO] [mChatSuite] Vault 1.2.15-b172 found hooking in.
2012-04-23 00:10:03 [INFO] [mChatSuite] PermissionsBukkit v1.6 found hooking in.
2012-04-23 00:10:03 [INFO] [mChatSuite] mChatSuite v1.2.4-b199jnks-R1 is enabled! [87ms]

please update to a compatible version of mChatSuite. - http://dev.bukkit.org/server-mods/mchat/