I use a plugin but it doesn't work...Author tell me that maybe it's a spigot issue and report this error to spigot so thecy can check.(My English is poor..I'm not very clear how to submit the problems and describe them...Sorry)

[23:39:22] [Server thread/ERROR]: Fatal error trying to convert Zombies v1.5.3:Zombies/Main.class

java.lang.ArrayIndexOutOfBoundsException: 2

at org.bukkit.craftbukkit.libs.org.objectweb.asm.ClassReader.readVerificationTypeInfo(ClassReader.java:3360) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.craftbukkit.libs.org.objectweb.asm.ClassReader.readStackMapFrame(ClassReader.java:3313) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.craftbukkit.libs.org.objectweb.asm.ClassReader.readCode(ClassReader.java:2063) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.craftbukkit.libs.org.objectweb.asm.ClassReader.readMethod(ClassReader.java:1492) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.craftbukkit.libs.org.objectweb.asm.ClassReader.accept(ClassReader.java:717) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.craftbukkit.libs.org.objectweb.asm.ClassReader.accept(ClassReader.java:401) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.craftbukkit.v1_15_R1.util.Commodore.convert(Commodore.java:130) ~[spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.craftbukkit.v1_15_R1.util.CraftMagicNumbers.processClass(CraftMagicNumbers.java:283) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:119) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:92) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at java.lang.ClassLoader.loadClass(Unknown Source) [?:1.8.0_201]

at java.lang.ClassLoader.loadClass(Unknown Source) [?:1.8.0_201]

at java.lang.Class.forName0(Native Method) ~[?:1.8.0_201]

at java.lang.Class.forName(Unknown Source) [?:1.8.0_201]

at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:60) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:334) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:253) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at org.bukkit.craftbukkit.v1_15_R1.CraftServer.loadPlugins(CraftServer.java:351) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at net.minecraft.server.v1_15_R1.DedicatedServer.init(DedicatedServer.java:203) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:784) [spigot-1.15.2.jar:git-Spigot-800b93f-8160e29]

at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]

[23:39:22] [Server thread/INFO]: [Zombies] Loading Zombies v1.5.3