RejectedExecutionException errors in server console

>....Exception in thread "DH-PriorityTaskPicker Thread[10185]" java.util.concurrent.RejectedExecutionException: Task com.seibel.distanthorizons.core.util.threading.PriorityTaskPicker$TrackedRunnable@3b44dff1 rejected from com.seibel.distanthorizons.core.util.threading.RateLimitedThreadPoolExecutor@a80e14a[Running, pool size = 4, active threads = 4, queued tasks = 4, completed tasks = 230191]
        at java.base/java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2081)
        at java.base/java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:841)
        at java.base/java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1376)
        at TRANSFORMER/distanthorizons@2.3.2-b/com.seibel.distanthorizons.core.util.threading.PriorityTaskPicker.tryStartNextTask(PriorityTaskPicker.java:78)
        at TRANSFORMER/distanthorizons@2.3.2-b/com.seibel.distanthorizons.core.util.threading.PriorityTaskPicker.access$200(PriorityTaskPicker.java:17)
        at TRANSFORMER/distanthorizons@2.3.2-b/com.seibel.distanthorizons.core.util.threading.PriorityTaskPicker$TrackedRunnable.run(PriorityTaskPicker.java:217)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
        at java.base/java.lang.Thread.run(Thread.java:1583)