Plugin Request Hyperconomy

How to fix this I use hyperconomy
This happens everytime I type /sell or buy ...

Code:

2015-02-09T20:52:56.164425063Z ... 13 more
2015-02-09T20:52:56.164425063Z at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[server.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
2015-02-09T20:52:56.164425063Z at regalowl.hyperconomy.bukkit.BukkitConnector.onCommand(BukkitConnector.java:112) ~[?:?]
2015-02-09T20:52:56.164425063Z at regalowl.hyperconomy.command.Sell.onCommand(Sell.java:63) ~[?:?]
2015-02-09T20:52:56.164425063Z at regalowl.hyperconomy.account.HyperPlayer.processTransaction(HyperPlayer.java:316) ~[?:?]
2015-02-09T20:52:56.164425063Z at regalowl.hyperconomy.transaction.TransactionProcessor.processTransaction(TransactionProcessor.java:89) ~[?:?]
2015-02-09T20:52:56.164425063Z at regalowl.hyperconomy.account.HyperPlayer.getInventory(HyperPlayer.java:274) ~[?:?]
2015-02-09T20:52:56.164425063Z at regalowl.hyperconomy.bukkit.BukkitConnector.getInventory(BukkitConnector.java:355) ~[?:?]
2015-02-09T20:52:56.164425063Z at regalowl.hyperconomy.bukkit.BukkitCommon.getInventory(BukkitCommon.java:259) ~[?:?]
2015-02-09T20:52:56.164425063Z at regalowl.hyperconomy.bukkit.BukkitCommon.getSerializableItemStack(BukkitCommon.java:440) ~[?:?]
2015-02-09T20:52:56.164425063Z at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
2015-02-09T20:52:56.164425063Z at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
2015-02-09T20:52:56.164425063Z at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[server.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
2015-02-09T20:52:56.164425063Z at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:67) ~[server.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
2015-02-09T20:52:56.164425063Z Caused by: java.lang.ClassNotFoundException: org.bukkit.inventory.meta.BannerMeta

 

@Dark_Boss_ It is looking for a 1.8 feature. You must have downloaded a 1.8 version of the plugin. Either upgrade Spigot or download a lower version of Hyperconomy.