[20:52:24] [Server thread/ERROR]: Could not load 'plugins\HolographicExtension-1.8.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: com/gmail/filoghost/holographicdisplays/api/placeholder/PlaceholderReplacer
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[Spigot.jar:git-Spigot-72c2605-251a5b6]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:329) ~[Spigot.jar:git-Spigot-72c2605-251a5b6]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [Spigot.jar:git-Spigot-72c2605-251a5b6]
	at org.bukkit.craftbukkit.v1_10_R1.CraftServer.loadPlugins(CraftServer.java:298) [Spigot.jar:git-Spigot-72c2605-251a5b6]
	at net.minecraft.server.v1_10_R1.DedicatedServer.init(DedicatedServer.java:203) [Spigot.jar:git-Spigot-72c2605-251a5b6]
	at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:535) [Spigot.jar:git-Spigot-72c2605-251a5b6]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_141]
Caused by: java.lang.NoClassDefFoundError: com/gmail/filoghost/holographicdisplays/api/placeholder/PlaceholderReplacer
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_141]
	at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_141]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[Spigot.jar:git-Spigot-72c2605-251a5b6]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[Spigot.jar:git-Spigot-72c2605-251a5b6]
	... 6 more
Caused by: java.lang.ClassNotFoundException: com.gmail.filoghost.holographicdisplays.api.placeholder.PlaceholderReplacer
	at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_141]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[Spigot.jar:git-Spigot-72c2605-251a5b6]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[Spigot.jar:git-Spigot-72c2605-251a5b6]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_141]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_141]
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_141]
	at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_141]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:64) ~[Spigot.jar:git-Spigot-72c2605-251a5b6]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) ~[Spigot.jar:git-Spigot-72c2605-251a5b6]
	... 6 more