I am getting this warning in the console every 10 minutes:

[15:36:59] [Craft Scheduler Thread - 1686/WARN]: [PlugMan] Plugin PlugMan v1.8.1 generated an exception while executing task 51 java.lang.NoSuchMethodError: org.bukkit.Server.getOnlinePlayers()[Lorg/bukkit/entity/Player; at com.ryanclancy000.plugman.utilities.MetricsLite.postPlugin(MetricsLite.java:261) ~[PlugMan.jar:?] at com.ryanclancy000.plugman.utilities.MetricsLite.access$300(MetricsLite.java:48) ~[PlugMan.jar:?] at com.ryanclancy000.plugman.utilities.MetricsLite$1.run(MetricsLite.java:153) ~[PlugMan.jar:?] at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:63) ~[patched_1.12.2.jar:git-Paper-1421] at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52) [patched_1.12.2.jar:git-Paper-1421] at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) [patched_1.12.2.jar:git-Paper-1421] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_171] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_171] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_171]

I was too quick :D Someone else already posted this