error showing up in the console for no apparent reason

java.lang.NoSuchMethodError: com.earth2me.essentials.ISettings.getSpawnJoinPriority()Lorg/bukkit/event/EventPriority;
at com.earth2me.essentials.spawn.EssentialsSpawn.onEnable(EssentialsSpawn.java:56) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:264) ~[spigot.jar:git-Spigot-b66ad9e-e1fb9cb]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) [spigot.jar:git-Spigot-b66ad9e-e1fb9cb]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:403) [spigot.jar:git-Spigot-b66ad9e-e1fb9cb]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:381) [spigot.jar:git-Spigot-b66ad9e-e1fb9cb]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:330) [spigot.jar:git-Spigot-b66ad9e-e1fb9cb]
at net.minecraft.server.v1_12_R1.MinecraftServer.t(MinecraftServer.java:422) [spigot.jar:git-Spigot-b66ad9e-e1fb9cb]
at net.minecraft.server.v1_12_R1.MinecraftServer.l(MinecraftServer.java:383) [spigot.jar:git-Spigot-b66ad9e-e1fb9cb]
at net.minecraft.server.v1_12_R1.MinecraftServer.a(MinecraftServer.java:338) [spigot.jar:git-Spigot-b66ad9e-e1fb9cb]
at net.minecraft.server.v1_12_R1.DedicatedServer.init(DedicatedServer.java:272) [spigot.jar:git-Spigot-b66ad9e-e1fb9cb]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:545) [spigot.jar:git-Spigot-b66ad9e-e1fb9cb]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_65]