CraftingStoreError

[20:01:21] [Server thread/INFO] [net.craftingstore.bukkit.CraftingStoreBukkit/]: [CraftingStore] Enabling CraftingStore v2.1.5
[20:01:24] [Server thread/ERROR] [Minecraft/]: Error occurred while enabling CraftingStore v2.1.5 (Is it up to date?)
java.lang.NoClassDefFoundError: net/craftingstore/core/provider/ProviderSelector
	at net.craftingstore.core.CraftingStore.<init>(CraftingStore.java:32) ~[?:?]
	at net.craftingstore.bukkit.CraftingStoreBukkit.onEnable(CraftingStoreBukkit.java:24) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:316) ~[JavaPlugin.class:KCauldron-1.7.10-2.1403.1.54]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:368) [JavaPluginLoader.class:KCauldron-1.7.10-2.1403.1.54]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:410) [SimplePluginManager.class:KCauldron-1.7.10-2.1403.1.54]
	at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugin(CraftServer.java:415) [CraftServer.class:KCauldron-1.7.10-2.1403.1.54]
	at org.bukkit.craftbukkit.v1_7_R4.CraftServer.enablePlugins(CraftServer.java:349) [CraftServer.class:KCauldron-1.7.10-2.1403.1.54]
	at net.minecraft.server.MinecraftServer.func_71243_i(MinecraftServer.java:500) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:474) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:434) [MinecraftServer.class:?]
	at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:335) [lt.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:620) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191]
Caused by: java.lang.ClassNotFoundException: Failed to remap class net.craftingstore.core.provider.ProviderSelector
	at org.bukkit.plugin.java.PluginClassLoader.remappedFindClass(PluginClassLoader.java:488) ~[PluginClassLoader.class:KCauldron-1.7.10-2.1403.1.54]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:409) ~[PluginClassLoader.class:KCauldron-1.7.10-2.1403.1.54]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:211) ~[PluginClassLoader.class:KCauldron-1.7.10-2.1403.1.54]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_191]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_191]
	... 13 more