BackPacks Error

[14:30:56] [Server thread/ERROR]: Fatal error trying to convert BackPack v1.1.4:com/evill4mer/BackPack/Main.class
java.lang.ArrayIndexOutOfBoundsException: 2
	at org.objectweb.asm.ClassReader.readVerificationTypeInfo(ClassReader.java:3152) ~[spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.objectweb.asm.ClassReader.readStackMapFrame(ClassReader.java:3099) ~[spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.objectweb.asm.ClassReader.readCode(ClassReader.java:1846) ~[spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.objectweb.asm.ClassReader.readMethod(ClassReader.java:1275) ~[spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.objectweb.asm.ClassReader.accept(ClassReader.java:679) ~[spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.objectweb.asm.ClassReader.accept(ClassReader.java:391) ~[spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.bukkit.craftbukkit.v1_13_R2.util.Commodore.convert(Commodore.java:130) ~[spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.bukkit.craftbukkit.v1_13_R2.util.CraftMagicNumbers.processClass(CraftMagicNumbers.java:238) [spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:107) [spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:80) [spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) [?:1.8.0_171]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) [?:1.8.0_171]
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_171]
	at java.lang.Class.forName(Class.java:348) [?:1.8.0_171]
	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:58) [spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:132) [spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:328) [spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:249) [spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at org.bukkit.craftbukkit.v1_13_R2.CraftServer.loadPlugins(CraftServer.java:325) [spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at net.minecraft.server.v1_13_R2.DedicatedServer.init(DedicatedServer.java:213) [spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:698) [spigot-1.13.2.jar:git-Spigot-e5e5c7c-4e4cde4]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_171]