Error

[MacBananaz]

Hello. I'm using Eclipse IDE, and I've added your API as an external library to my plugin. I followed all the steps, but got this error when playing a song:

[01:55:08] [Server thread/WARN]: java.io.EOFException
[01:55:08] [Server thread/WARN]: at java.io.DataInputStream.readByte(Unknown Source)
[01:55:08] [Server thread/WARN]: at com.xxmicloxx.NoteBlockAPI.NBSDecoder.readString(NBSDecoder.java:104)
[01:55:08] [Server thread/WARN]: at com.xxmicloxx.NoteBlockAPI.NBSDecoder.parse(NBSDecoder.java:27)
[01:55:08] [Server thread/WARN]: at com.xxmicloxx.NoteBlockAPI.NBSDecoder.parse(NBSDecoder.java:10)
[01:55:08] [Server thread/WARN]: at me.alcachofra.multivertice.OnJoin.onPlayerJoin(OnJoin.java:35)
[01:55:08] [Server thread/WARN]: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[01:55:08] [Server thread/WARN]: at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[01:55:08] [Server thread/WARN]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[01:55:08] [Server thread/WARN]: at java.lang.reflect.Method.invoke(Unknown Source)
[01:55:08] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:315)
[01:55:08] [Server thread/WARN]: at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70)
[01:55:08] [Server thread/WARN]: at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:589)
[01:55:08] [Server thread/WARN]: at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:576)
[01:55:08] [Server thread/WARN]: at net.minecraft.server.v1_16_R1.PlayerList.a(PlayerList.java:199)
[01:55:08] [Server thread/WARN]: at net.minecraft.server.v1_16_R1.LoginListener.c(LoginListener.java:153)
[01:55:08] [Server thread/WARN]: at net.minecraft.server.v1_16_R1.LoginListener.tick(LoginListener.java:52)
[01:55:08] [Server thread/WARN]: at net.minecraft.server.v1_16_R1.NetworkManager.a(NetworkManager.java:219)
[01:55:08] [Server thread/WARN]: at net.minecraft.server.v1_16_R1.ServerConnection.c(ServerConnection.java:128)
[01:55:08] [Server thread/WARN]: at net.minecraft.server.v1_16_R1.MinecraftServer.b(MinecraftServer.java:1126)
[01:55:08] [Server thread/WARN]: at net.minecraft.server.v1_16_R1.DedicatedServer.b(DedicatedServer.java:354)
[01:55:08] [Server thread/WARN]: at net.minecraft.server.v1_16_R1.MinecraftServer.a(MinecraftServer.java:1007)
[01:55:08] [Server thread/WARN]: at net.minecraft.server.v1_16_R1.MinecraftServer.v(MinecraftServer.java:846)
[01:55:08] [Server thread/WARN]: at net.minecraft.server.v1_16_R1.MinecraftServer.lambda$0(MinecraftServer.java:164)
[01:55:08] [Server thread/WARN]: at java.lang.Thread.run(Unknown Source)
[01:55:08] [Thread-29/WARN]: Exception in thread "Thread-29"
[01:55:08] [Thread-29/WARN]: java.lang.NullPointerException
[01:55:08] [Thread-29/WARN]: at com.xxmicloxx.NoteBlockAPI.SongPlayer$1.run(SongPlayer.java:90)
[01:55:08] [Thread-29/WARN]: at java.lang.Thread.run(Unknown Source)

How could I fix this? Also, I'm using 1.16.