AntiShare Error

20:03:25 [SEVERE] Could not call method 'public static org.bukkit.inventory.ItemStack org.bukkit.inventory.ItemStack.deserialize(java.util.Map)' of class org.bukkit.inventory.ItemStack for deserialization
java.lang.reflect.InvocationTargetException
	at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.bukkit.configuration.serialization.ConfigurationSerialization.deserializeViaMethod(ConfigurationSerialization.java:63)
	at org.bukkit.configuration.serialization.ConfigurationSerialization.deserialize(ConfigurationSerialization.java:99)
	at org.bukkit.configuration.serialization.ConfigurationSerialization.deserializeObject(ConfigurationSerialization.java:171)
	at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:36)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:183)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndStep(BaseConstructor.java:326)
	at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndStep(SafeConstructor.java:143)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseConstructor.java:307)
	at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.construct(SafeConstructor.java:459)
	at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.construct(YamlConstructor.java:27)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:183)
	at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:142)
	at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:128)
	at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:480)
	at org.yaml.snakeyaml.Yaml.load(Yaml.java:399)
	at org.bukkit.configuration.file.YamlConfiguration.loadFromString(YamlConfiguration.java:54)
	at com.feildmaster.lib.configuration.EnhancedConfiguration.loadFromString(EnhancedConfiguration.java:222)
	at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:143)
	at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:109)
	at com.feildmaster.lib.configuration.EnhancedConfiguration.load(EnhancedConfiguration.java:156)
	at com.turt2live.antishare.ASInventory.load(ASInventory.java:94)
	at com.turt2live.antishare.AntiShareListener$1.run(AntiShareListener.java:479)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Short
	at org.bukkit.inventory.ItemStack.deserialize(ItemStack.java:363)
	... 26 more