[22:35:52] [Server thread/ERROR]: Could not load 'plugins\AncientGates1-8-3.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/libs/com/google/gson/GsonBuilder
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) ~[spigot.jar:git-Spigot-2ec6f06-7722428]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[spigot.jar:git-Spigot-2ec6f06-7722428]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [spigot.jar:git-Spigot-2ec6f06-7722428]
	at org.bukkit.craftbukkit.v1_8_R2.CraftServer.loadPlugins(CraftServer.java:291) [spigot.jar:git-Spigot-2ec6f06-7722428]
	at net.minecraft.server.v1_8_R2.DedicatedServer.init(DedicatedServer.java:199) [spigot.jar:git-Spigot-2ec6f06-7722428]
	at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:522) [spigot.jar:git-Spigot-2ec6f06-7722428]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_75]
Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/libs/com/google/gson/GsonBuilder
	at org.mcteam.ancientgates.Plugin.<clinit>(Plugin.java:92) ~[?:?]
	at java.lang.Class.forName0(Native Method) ~[?:1.7.0_75]
	at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_75]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot.jar:git-Spigot-2ec6f06-7722428]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[spigot.jar:git-Spigot-2ec6f06-7722428]
	... 6 more
Caused by: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.libs.com.google.gson.GsonBuilder
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[spigot.jar:git-Spigot-2ec6f06-7722428]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-2ec6f06-7722428]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_75]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_75]
	at org.mcteam.ancientgates.Plugin.<clinit>(Plugin.java:92) ~[?:?]
	at java.lang.Class.forName0(Native Method) ~[?:1.7.0_75]
	at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_75]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[spigot.jar:git-Spigot-2ec6f06-7722428]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[spigot.jar:git-Spigot-2ec6f06-7722428]
	... 6 more