My plugins are acting really weird or something...I was trying to setup PlotMe and the plugin wouldn't work so I was trying some things out and now whenever I do /help it says Error:0 and really nothing is working. Here's my server log when I start it up: Last login: Tue Jul 1 21:22:35 on ttys000 /Users/gaming-user/Desktop/server/start.command ; exit; Gaming-Users-MacBook-Pro:~ gaming-user$ /Users/gaming-user/Desktop/server/start.command ; exit; Loading libraries, please wait... [21:44:07 INFO]: Starting minecraft server version 1.7.9 [21:44:07 INFO]: Loading properties [21:44:07 INFO]: Default game type: SURVIVAL [21:44:07 INFO]: Generating keypair [21:44:08 INFO]: Starting Minecraft server on *:25565 [21:44:08 INFO]: This server is running CraftBukkit version git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks (MC: 1.7.9) (Implementing API version 1.7.9-R0.2) [21:44:09 ERROR]: Could not load 'plugins/PlotMe.jar' in folder 'plugins' org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/worldcretornica/plotme/PlotMe : Unsupported major.minor version 51.0 at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:328) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] at org.bukkit.craftbukkit.v1_7_R3.CraftServer.loadPlugins(CraftServer.java:355) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] at org.bukkit.craftbukkit.v1_7_R3.CraftServer.<init>(CraftServer.java:317) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] at net.minecraft.server.v1_7_R3.PlayerList.<init>(PlayerList.java:68) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] at net.minecraft.server.v1_7_R3.DedicatedPlayerList.<init>(SourceFile:14) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] at net.minecraft.server.v1_7_R3.DedicatedServer.init(DedicatedServer.java:126) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:436) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] Caused by: java.lang.UnsupportedClassVersionError: com/worldcretornica/plotme/PlotMe : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.6.0_65] at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) ~[?:1.6.0_65] at java.lang.ClassLoader.defineClass(ClassLoader.java:621) ~[?:1.6.0_65] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) ~[?:1.6.0_65] at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) ~[?:1.6.0_65] at java.net.URLClassLoader.access$000(URLClassLoader.java:58) ~[?:1.6.0_65] at java.net.URLClassLoader$1.run(URLClassLoader.java:197) ~[?:1.6.0_65] at java.security.AccessController.doPrivileged(Native Method) ~[?:1.6.0_65] at java.net.URLClassLoader.findClass(URLClassLoader.java:190) ~[?:1.6.0_65] at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] at java.lang.ClassLoader.loadClass(ClassLoader.java:306) ~[?:1.6.0_65] at java.lang.ClassLoader.loadClass(ClassLoader.java:247) ~[?:1.6.0_65] at java.lang.Class.forName0(Native Method) ~[?:1.6.0_65] at java.lang.Class.forName(Class.java:249) ~[?:1.6.0_65] at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:40) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:127) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks] ... 9 more [21:44:09 INFO]: ----- Bukkit Auto Updater ----- [21:44:09 INFO]: It appears that you're running a Beta Build, when you've specified in bukkit.yml that you prefer to run Recommended Builds. [21:44:09 INFO]: If you would like to be kept informed about new Beta Build releases, it is recommended that you change 'preferred-channel' in your bukkit.yml to 'beta'. [21:44:09 INFO]: With that set, you will be told whenever a new version is available for download, so that you can always keep up to date and secure with the latest fixes. [21:44:09 INFO]: If you would like to disable this warning, simply set 'suggest-channels' to false in bukkit.yml. [21:44:09 INFO]: ----- ------------------- ----- [21:44:09 INFO]: [WorldEdit] Loading WorldEdit v5.6.2 [21:44:09 INFO]: [PermissionsEx] Loading PermissionsEx v1.22 [21:44:09 INFO]: [Multiverse-Core] Loading Multiverse-Core v2.4-b527 [21:44:09 INFO]: [Multiverse-Portals] Loading Multiverse-Portals v2.4-b548 [21:44:09 INFO]: [Essentials] Loading Essentials v2.13.1 [21:44:09 INFO]: [CommandBook] Loading CommandBook v2.3 [21:44:09 INFO]: [EssentialsChat] Loading EssentialsChat v2.13.1 [21:44:09 INFO]: [EssentialsProtect] Loading EssentialsProtect v2.13.1 [21:44:09 INFO]: [EssentialsSpawn] Loading EssentialsSpawn v2.13.1 [21:44:09 INFO]: [WorldGuard] Loading WorldGuard v5.9 [21:44:09 INFO]: [CraftBook] Loading CraftBook v3.8-SNAPSHOT:3803-e037f90,master [21:44:09 INFO]: Preparing level "world" [21:44:09 INFO]: Preparing start region for level 0 (Seed: 3452124842729323141) [21:44:10 INFO]: Preparing spawn area: 50% [21:44:11 INFO]: Preparing start region for level 1 (Seed: 3452124842729323141) [21:44:12 INFO]: Preparing start region for level 2 (Seed: 3452124842729323141) [21:44:13 INFO]: [WorldEdit] Enabling WorldEdit v5.6.2 [21:44:13 INFO]: WEPIF: Using the Bukkit Permissions API. [21:44:13 INFO]: [PermissionsEx] Enabling PermissionsEx v1.22 [21:44:13 INFO]: [PermissionsEx] Initializing file backend [21:44:13 INFO]: [PermissionsEx] Permissions file successfully reloaded [21:44:13 INFO]: WEPIF: PermissionsEx detected! Using PermissionsEx for permissions. [21:44:13 INFO]: [Multiverse-Core] Enabling Multiverse-Core v2.4-b527 [21:44:13 INFO]: [Multiverse-Core] - Version 2.4-b527 (API v14) Enabled - By Rigby, fernferret, lithium3141 and main-- [21:44:13 INFO]: [AllPay] - Version 10.0 - hooked into Essentials Economy for Multiverse-Core v2.4-b527 [21:44:14 INFO]: [Multiverse-Core] Loading World & Settings - 'world' - Env: NORMAL - Type: NORMAL & seed: 3452124842729323141 [21:44:14 INFO]: [Multiverse-Core] Loading World & Settings - 'world_nether' - Env: NETHER - Type: NORMAL & seed: 3452124842729323141 [21:44:14 INFO]: [Multiverse-Core] Loading World & Settings - 'world_the_end' - Env: THE_END - Type: NORMAL & seed: 3452124842729323141 [21:44:14 INFO]: [Multiverse-Core] 3 - World(s) loaded. [21:44:14 INFO]: [Multiverse-Portals] Enabling Multiverse-Portals v2.4-b548 [21:44:14 INFO]: [Multiverse-Portals] - Version 2.4-b548 Enabled - By Rigby and fernferret [21:44:14 INFO]: [Multiverse-Portals] 0 - Portals(s) loaded [21:44:15 INFO]: [Essentials] Enabling Essentials v2.13.1 [21:44:17 INFO]: Essentials: Using PermissionsEx based permissions. [21:44:18 INFO]: [CommandBook] Enabling CommandBook v2.3 [21:44:18 INFO]: [CommandBook] Maximum wrapper compatibility is enabled. Some features have been disabled to be compatible with poorly written server wrappers. [21:44:18 WARN]: [CommandBook] Failed to load warps: plugins/CommandBook/homes.csv (No such file or directory) [21:44:18 WARN]: [CommandBook] Failed to load warps: plugins/CommandBook/warps.csv (No such file or directory) [21:44:18 INFO]: [CommandBook] 1 kit(s) loaded. [21:44:18 INFO]: [EssentialsChat] Enabling EssentialsChat v2.13.1 [21:44:18 INFO]: [EssentialsProtect] Enabling EssentialsProtect v2.13.1 [21:44:18 INFO]: [EssentialsSpawn] Enabling EssentialsSpawn v2.13.1 [21:44:18 INFO]: [WorldGuard] Enabling WorldGuard v5.9 [21:44:18 INFO]: [WorldGuard] Default configuration file written: /Users/dreceveur/Desktop/server/plugins/WorldGuard/config.yml [21:44:18 INFO]: [WorldGuard] Default configuration file written: /Users/dreceveur/Desktop/server/plugins/WorldGuard/worlds/world/config.yml [21:44:18 INFO]: [WorldGuard] Default configuration file written: /Users/dreceveur/Desktop/server/plugins/WorldGuard/worlds/world/blacklist.txt [21:44:18 INFO]: [WorldGuard] (world) TNT ignition is PERMITTED. [21:44:18 INFO]: [WorldGuard] (world) Lighters are PERMITTED. [21:44:18 INFO]: [WorldGuard] (world) Lava fire is blocked. [21:44:18 INFO]: [WorldGuard] (world) Fire spread is UNRESTRICTED. [21:44:18 INFO]: [WorldGuard] Loaded configuration for world 'world' [21:44:18 INFO]: [WorldGuard] Default configuration file written: /Users/dreceveur/Desktop/server/plugins/WorldGuard/worlds/world_nether/config.yml [21:44:18 INFO]: [WorldGuard] Default configuration file written: /Users/dreceveur/Desktop/server/plugins/WorldGuard/worlds/world_nether/blacklist.txt [21:44:18 INFO]: [WorldGuard] (world_nether) TNT ignition is PERMITTED. [21:44:18 INFO]: [WorldGuard] (world_nether) Lighters are PERMITTED. [21:44:18 INFO]: [WorldGuard] (world_nether) Lava fire is blocked. [21:44:18 INFO]: [WorldGuard] (world_nether) Fire spread is UNRESTRICTED. [21:44:18 INFO]: [WorldGuard] Loaded configuration for world 'world_nether' [21:44:18 INFO]: [WorldGuard] Default configuration file written: /Users/dreceveur/Desktop/server/plugins/WorldGuard/worlds/world_the_end/config.yml [21:44:18 INFO]: [WorldGuard] Default configuration file written: /Users/dreceveur/Desktop/server/plugins/WorldGuard/worlds/world_the_end/blacklist.txt [21:44:19 INFO]: [WorldGuard] (world_the_end) TNT ignition is PERMITTED. [21:44:19 INFO]: [WorldGuard] (world_the_end) Lighters are PERMITTED. [21:44:19 INFO]: [WorldGuard] (world_the_end) Lava fire is blocked. [21:44:19 INFO]: [WorldGuard] (world_the_end) Fire spread is UNRESTRICTED. [21:44:19 INFO]: [WorldGuard] Loaded configuration for world 'world_the_end' [21:44:19 INFO]: [WorldGuard] 0 regions loaded for 'world' [21:44:19 INFO]: [WorldGuard] 0 regions loaded for 'world_nether' [21:44:19 INFO]: [WorldGuard] 0 regions loaded for 'world_the_end' [21:44:19 INFO]: [CraftBook] Enabling CraftBook v3.8-SNAPSHOT:3803-e037f90,master [21:44:19 INFO]: [CraftBook] Loading persistent data from YAML! [21:44:20 INFO]: [CraftBook] Enumerating chunks for self-triggered components... [21:44:20 INFO]: [CraftBook] 1875 chunk(s) for 3 world(s) processed (63ms elapsed) [21:44:21 INFO]: [CraftBook] CraftBook v3.9 Beta 2 is the latest version available, and the updatability of it is: UPDATE_AVAILABLE. You currently have version CraftBook v3.9 Beta 2 installed. [21:44:21 INFO]: Server permissions file permissions.yml is empty, ignoring it [21:44:21 INFO]: Done (11.869s)! For help, type "help" or "?" [21:44:22 WARN]: [CraftBook] ?cWarning! You have no mechanics enabled, the plugin will appear to do nothing until a feature is enabled! > The plugins I'm running are: Essentials (not AntiBuild) PermissionsEx CraftBook CommandBook Multiverse {Core} Multiverse {Portals} WorldEdit WorldGuard PlotMe I'm running my server on a Mac, can somebody please help me?