[22:27:32 ERROR]: Please notify author of plugin causing this execution to fix this bug! see: http://bit.ly/1oSiM6C
java.lang.Throwable
        at org.bukkit.craftbukkit.v1_11_R1.CraftServer.dispatchCommand(CraftServer.java:657) [paperspigot.jar:git-Paper-1104]
        at org.bukkit.Bukkit.dispatchCommand(Bukkit.java:597) [paperspigot.jar:git-Paper-1104]
        at com.vintric.MCDonateIP.Checker.run(Checker.java:50) [MCDonateIP.jar:?]
        at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftTask.run(CraftTask.java:58) [paperspigot.jar:git-Paper-1104]
        at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52) [paperspigot.jar:git-Paper-1104]
        at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) [paperspigot.jar:git-Paper-1104]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_171]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_171]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_171]