Error code mc spigot server 1.8.4

[16:56:59 INFO]: Loading properties
[16:56:59 INFO]: Default game type: SURVIVAL
[16:56:59 INFO]: Generating keypair
[16:56:59 INFO]: Starting Minecraft server on *:40084
[16:57:00 INFO]: This server is running CraftBukkit version git-Bukkit-15e81cf (MC: 1.8) (Implementing API version 1.8-R0.1-SNAPSHOT)
[16:57:00 ERROR]: Could not load 'plugins/DennisGodFly.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: Cannot find main class `me.JordieNiels.DennisGodFly'
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:42) ~[craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:328) ~[craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugins(CraftServer.java:288) [craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        at org.bukkit.craftbukkit.v1_8_R1.CraftServer.<init>(CraftServer.java:250) [craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        at net.minecraft.server.v1_8_R1.PlayerList.<init>(PlayerList.java:69) [craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        at net.minecraft.server.v1_8_R1.DedicatedPlayerList.<init>(SourceFile:14) [craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:133) [craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:473) [craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        at java.lang.Thread.run(Thread.java:745) [?:1.7.0_79]
Caused by: java.lang.ClassNotFoundException: me.JordieNiels.DennisGodFly
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366) ~[?:1.7.0_79]
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[?:1.7.0_79]
        at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_79]
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[?:1.7.0_79]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_79]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_79]
        at java.lang.Class.forName0(Native Method) ~[?:1.7.0_79]
        at java.lang.Class.forName(Class.java:274) ~[?:1.7.0_79]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:40) ~[craftbukkit-1.8.jar:git-Bukkit-15e81cf]
        ... 10 more
[16:57:00 INFO]: Preparing level "world"
[16:57:00 INFO]: Preparing start region for level 0 (Seed: 6453983789500210412)
[16:57:01 INFO]: Preparing spawn area: 21%
[16:57:02 INFO]: Preparing spawn area: 53%
[16:57:03 INFO]: Preparing start region for level 1 (Seed: 6453983789500210412)
[16:57:04 INFO]: Preparing start region for level 2 (Seed: 6453983789500210412)
[16:57:04 INFO]: Server permissions file permissions.yml is empty, ignoring it
[16:57:04 INFO]: Done (4.153s)! For help, type "help" or "?"
[16:57:04 INFO]: Starting GS4 status listener
[16:57:04 INFO]: Query running on 0.0.0.0:40084
[16:57:11 WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2946ms behind, skipping 58 tick(s)
say §bRented §bfrom §6§nServer.pro§r §b- §bFree §bGame §bHosting
say §bGet §6Premium§r §bto §bremove §bads
[16:57:22 INFO]: [Server] §bRented §bfrom §6§nServer.pro§r §b- §bFree §bGame §bHosting
[16:57:23 INFO]: [Server] §bGet §6Premium§r §bto §bremove §bads