bug

[23:52:35] [Server thread/ERROR]: Error occurred while enabling AgarthaLib v2.16.1 (Is it up to date?)
java.lang.NullPointerException: null
	at be.maximvdw.placeholderapi.PlaceholderAPI.registerPlaceholder(PlaceholderAPI.java:143) ~[?:?]
	at com.praya.agarthalib.placeholder.replacer.ReplacerMVDWPlaceholderAPI.register(ReplacerMVDWPlaceholderAPI.java:28) ~[?:?]
	at com.praya.agarthalib.manager.plugin.PlaceholderManager.registerAll(PlaceholderManager.java:41) ~[?:?]
	at com.praya.agarthalib.AgarthaLib.registerPlaceholder(AgarthaLib.java:146) ~[?:?]
	at com.praya.agarthalib.AgarthaLib.onEnable(AgarthaLib.java:134) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:254) ~[patched_1.13.2.jar:git-Paper-463]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:325) ~[patched_1.13.2.jar:git-Paper-463]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) ~[patched_1.13.2.jar:git-Paper-463]
	at org.bukkit.craftbukkit.v1_13_R2.CraftServer.enablePlugin(CraftServer.java:441) ~[patched_1.13.2.jar:git-Paper-463]
	at org.bukkit.craftbukkit.v1_13_R2.CraftServer.enablePlugins(CraftServer.java:355) ~[patched_1.13.2.jar:git-Paper-463]
	at net.minecraft.server.v1_13_R2.MinecraftServer.l(MinecraftServer.java:613) ~[patched_1.13.2.jar:git-Paper-463]
	at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:575) ~[patched_1.13.2.jar:git-Paper-463]
	at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:435) ~[patched_1.13.2.jar:git-Paper-463]
	at net.minecraft.server.v1_13_R2.DedicatedServer.init(DedicatedServer.java:316) ~[patched_1.13.2.jar:git-Paper-463]
	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:791) ~[patched_1.13.2.jar:git-Paper-463]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_192]
[23:52:35] [Server thread/INFO]: [AgarthaLib] Disabling AgarthaLib v2.16.1