error trailgui

[16:04:43] [Server thread/INFO]: [TrailGUI] Enabling TrailGUI v5.0.1-b59-SNAPSHOT
[16:04:44] [Server thread/ERROR]: Error occurred while enabling TrailGUI v5.0.1-b59-SNAPSHOT (Is it up to date?)
java.lang.NoClassDefFoundError: org/bukkit/Particle
    at ca.jamiesinn.trailgui.trails.NormalTrail.loadType(NormalTrail.java:18) ~[?:?]
    at ca.jamiesinn.trailgui.trails.NormalTrail.<init>(NormalTrail.java:12) ~[?:?]
    at ca.jamiesinn.trailgui.TrailGUI.loadTrails(TrailGUI.java:164) ~[?:?]
    at ca.jamiesinn.trailgui.TrailGUI.load(TrailGUI.java:126) ~[?:?]
    at ca.jamiesinn.trailgui.TrailGUI.onEnable(TrailGUI.java:96) ~[?:?]
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot.jar:git-Spigot-db6de12-d3e0b6f]
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [spigot.jar:git-Spigot-db6de12-d3e0b6f]
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot.jar:git-Spigot-db6de12-d3e0b6f]
    at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357) [spigot.jar:git-Spigot-db6de12-d3e0b6f]
    at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317) [spigot.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:414) [spigot.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:378) [spigot.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:333) [spigot.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:263) [spigot.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525) [spigot.jar:git-Spigot-db6de12-d3e0b6f]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_66]
Caused by: java.lang.ClassNotFoundException: org.bukkit.Particle
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[spigot.jar:git-Spigot-db6de12-d3e0b6f]
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-db6de12-d3e0b6f]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_66]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_66]
    ... 16 more