Erro InfoBukkit

[16:13:29 ERROR]: Could not load 'plugins/InfoBook.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.Error: Unresolved compilation problems:
        The import org.bukkit.inventory.meta cannot be resolved
        WRITTEN_BOOK cannot be resolved or is not a field
        BookMeta cannot be resolved to a type
        BookMeta cannot be resolved to a type
        The method getItemMeta() is undefined for the type ItemStack
        WRITTEN_BOOK cannot be resolved or is not a field
        BookMeta cannot be resolved to a type
        BookMeta cannot be resolved to a type
        The method getItemMeta() is undefined for the type ItemStack
        WRITTEN_BOOK cannot be resolved or is not a field
        BookMeta cannot be resolved to a type
        BookMeta cannot be resolved to a type
        The method getItemMeta() is undefined for the type ItemStack
        WRITTEN_BOOK cannot be resolved or is not a field
        BookMeta cannot be resolved to a type
        BookMeta cannot be resolved to a type
        The method getItemMeta() is undefined for the type ItemStack

        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[Spigot.jar:git-Spigot-1571]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[Spigot.jar:git-Spigot-1571]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [Spigot.jar:git-Spigot-1571]
        at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugins(CraftServer.java:369) [Spigot.jar:git-Spigot-1571]
        at net.minecraft.server.v1_7_R4.DedicatedServer.init(DedicatedServer.java:152) [Spigot.jar:git-Spigot-1571]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:458) [Spigot.jar:git-Spigot-1571]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [Spigot.jar:git-Spigot-1571]
Caused by: java.lang.Error: Unresolved compilation problems:
        The import org.bukkit.inventory.meta cannot be resolved
        WRITTEN_BOOK cannot be resolved or is not a field
        BookMeta cannot be resolved to a type
        BookMeta cannot be resolved to a type
        The method getItemMeta() is undefined for the type ItemStack
        WRITTEN_BOOK cannot be resolved or is not a field
        BookMeta cannot be resolved to a type
        BookMeta cannot be resolved to a type
        The method getItemMeta() is undefined for the type ItemStack
        WRITTEN_BOOK cannot be resolved or is not a field
        BookMeta cannot be resolved to a type
        BookMeta cannot be resolved to a type
        The method getItemMeta() is undefined for the type ItemStack
        WRITTEN_BOOK cannot be resolved or is not a field
        BookMeta cannot be resolved to a type
        BookMeta cannot be resolved to a type
        The method getItemMeta() is undefined for the type ItemStack

        at me.infobook.InfoBook.<init>(InfoBook.java:26) ~[?:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.7.0_45]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) ~[?:1.7.0_45]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.7.0_45]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:526) ~[?:1.7.0_45]
        at java.lang.Class.newInstance(Class.java:374) ~[?:1.7.0_45]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:73) ~[Spigot.jar:git-Spigot-1571]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[Spigot.jar:git-Spigot-1571]
        ... 6 more