[18:53:38 ERROR]: [MapModCompanion - FileChangeWatchdog] File change callback error
java.lang.UnsupportedOperationException: null
        at org.bukkit.craftbukkit.scheduler.CraftScheduler.handle(CraftScheduler.java:533) ~[main/:?]
        at org.bukkit.craftbukkit.scheduler.CraftScheduler.runTaskTimer(CraftScheduler.java:233) ~[main/:?]
        at org.bukkit.craftbukkit.scheduler.CraftScheduler.runTaskTimer(CraftScheduler.java:209) ~[main/:?]
        at org.bukkit.craftbukkit.scheduler.CraftScheduler.scheduleSyncRepeatingTask(CraftScheduler.java:204) ~[main/:?]
        at org.bukkit.craftbukkit.scheduler.CraftScheduler.scheduleSyncDelayedTask(CraftScheduler.java:168) ~[main/:?]
        at org.bukkit.craftbukkit.scheduler.CraftScheduler.scheduleSyncDelayedTask(CraftScheduler.java:137) ~[main/:?]
        at com.turikhay.mc.mapmodcompanion.spigot.MapModCompanion.lambda$load$0(MapModCompanion.java:93) ~[MapModCompanion.jar:?]
        at com.turikhay.mc.mapmodcompanion.FileChangeWatchdog.tick(FileChangeWatchdog.java:55) ~[MapModCompanion.jar:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) ~[?:?]
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305) ~[?:?]
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305) ~[?:?]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[?:?]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[?:?]
        at java.lang.Thread.run(Thread.java:840) ~[?:?]