Bukkit

Hey, I am getting this exception while trying to run my server, I hope you can fix it.

[22:21:50 WARN]: java.lang.NullPointerException
[22:21:50 WARN]:        at org.bukkit.craftbukkit.v1_8_R3.inventory.CraftMetaEnchantedBook.addStoredEnchant(CraftMetaEnchantedBook.java:150)
[22:21:50 WARN]:        at ru.blc.guishop.utils.ItemMetaUtil.getEnchantmentsMeta(ItemMetaUtil.java:82)
[22:21:50 WARN]:        at ru.blc.guishop.utils.ItemUtil.getSpecialMeta(ItemUtil.java:73)
[22:21:50 WARN]:        at ru.blc.guishop.utils.ItemUtil.load(ItemUtil.java:66)
[22:21:50 WARN]:        at ru.blc.guishop.gui.Tab.loadItems(Tab.java:166)
[22:21:50 WARN]:        at ru.blc.guishop.gui.Tab.loadVipTab(Tab.java:145)
[22:21:50 WARN]:        at ru.blc.guishop.gui.GUI.generateVipTabs(GUI.java:226)
[22:21:50 WARN]:        at ru.blc.guishop.gui.GUI.createShop(GUI.java:34)
[22:21:50 WARN]:        at ru.blc.guishop.GuiShopRecoded.onEnable(GuiShopRecoded.java:82)
[22:21:50 WARN]:        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321)
[22:21:50 WARN]:        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340)
[22:21:50 WARN]:        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405)
[22:21:50 WARN]:        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357)
[22:21:50 WARN]:        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317)
[22:21:50 WARN]:        at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:414)
[22:21:50 WARN]:        at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:378)
[22:21:50 WARN]:        at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:333)
[22:21:50 WARN]:        at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:263)
[22:21:50 WARN]:        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525)
[22:21:50 WARN]:        at java.lang.Thread.run(Thread.java:745)

This error is due to the fact that the plugin is not designed for older versions (only 1.10 and newer).
Work on older versions of the plugin seems possible, but it needs to be removed from configuration items and enchantments that have been added in new versions.

Go to GuiShop Recoded folder -> vipmenu -> vipmenu2.yml (use any text editor to open, I recomend to use notepad++)
in this file you should to remove this (37-42 line):

mending:
  ID: 403
  Data: 0
  Ammount: 1
  Price: 1000
  Enchantments: mending,1

 and this(97-102 line):

frost_walker:
  ID: 403
  Data: 0
  Ammount: 1
  Price: 1000
  Enchantments: frost_walker,2

 then save and restart your server.

Be careful, and do not forget that plugin is not designed for older versions (only 1.10 and newer).