error spam

[18:42:56] [Server thread/WARN]: [EpicHoppers] Task #49 for EpicHoppers v4.1.8 generated an exception
java.lang.NoSuchMethodError: com.songoda.epichoppers.EpicHoppers.getLocale()Lcom/songoda/epichoppers/Locale;
        at com.songoda.epichoppers.mobhoppers.ModuleMobHopper.getGUIButton(ModuleMobHopper.java:72) ~[?:?]
        at com.songoda.epichoppers.gui.GUIOverview.lambda$constructGUI$0(GUIOverview.java:146) ~[?:?]
        at java.util.stream.ReferencePipeline$2$1.accept(Unknown Source) ~[?:1.8.0_181]
        at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source) ~[?:1.8.0_181]
        at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[?:1.8.0_181]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[?:1.8.0_181]
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[?:1.8.0_181]
        at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[?:1.8.0_181]
        at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[?:1.8.0_181]
        at com.songoda.epichoppers.gui.GUIOverview.constructGUI(GUIOverview.java:146) ~[?:?]
        at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftTask.run(CraftTask.java:81) ~[spigot-1.14.4.jar:git-Spigot-6a14ca4-1215188]
        at org.bukkit.craftbukkit.v1_14_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:394) [spigot-1.14.4.jar:git-Spigot-6a14ca4-1215188]
        at net.minecraft.server.v1_14_R1.MinecraftServer.b(MinecraftServer.java:1021) [spigot-1.14.4.jar:git-Spigot-6a14ca4-1215188]
        at net.minecraft.server.v1_14_R1.DedicatedServer.b(DedicatedServer.java:396) [spigot-1.14.4.jar:git-Spigot-6a14ca4-1215188]
        at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:969) [spigot-1.14.4.jar:git-Spigot-6a14ca4-1215188]
        at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:814) [spigot-1.14.4.jar:git-Spigot-6a14ca4-1215188]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]