error

[12:17:27] [Server thread/INFO]: [EnderSync] Enabling EnderSync v4.0.3*
[12:17:27] [Server thread/INFO]:
[12:17:27] [Server thread/INFO]: » EnderSync * Enabling EnderSync plugin v4.0.3
[12:17:27] [Server thread/INFO]:
[12:17:27] [Server thread/INFO]: » EnderSync *
[12:17:27] [Server thread/INFO]: » EnderSync * ERROR: Unsupported server version: v1_14_R1
[12:17:27] [Server thread/INFO]: » EnderSync *
[12:17:27] [Server thread/INFO]:
[12:17:27] [Server thread/INFO]: » EnderSync * Disabling EnderSync plugin v4.0.3
[12:17:27] [Server thread/INFO]: » EnderSync * Disabling networking ...
[12:17:27] [Server thread/ERROR]: Error occurred while enabling EnderSync v4.0.3 (Is it up to date?)
java.lang.NullPointerException: null
	at stackunderflow.endersync.Main.onDisable(Main.java:278) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:265) ~[patched_1.14.4.jar:git-Paper-226]
	at stackunderflow.endersync.Main.onEnable(Main.java:155) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[patched_1.14.4.jar:git-Paper-226]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:338) ~[patched_1.14.4.jar:git-Paper-226]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:420) ~[patched_1.14.4.jar:git-Paper-226]
	at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugin(CraftServer.java:467) ~[patched_1.14.4.jar:git-Paper-226]
	at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugins(CraftServer.java:381) ~[patched_1.14.4.jar:git-Paper-226]
	at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:474) ~[patched_1.14.4.jar:git-Paper-226]
	at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:290) ~[patched_1.14.4.jar:git-Paper-226]
	at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:876) ~[patched_1.14.4.jar:git-Paper-226]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]