[00:00:50 WARN]: Exception in thread "Craft Scheduler Thread - 67"
[00:00:50 WARN]: org.apache.commons.lang.UnhandledException: Plugin Autorank v3.8.4 generated an exception while executing task 17071
        at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException: Nodes must be provided.
        at org.yaml.snakeyaml.nodes.NodeTuple.<init>(NodeTuple.java:28)
        at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:163)
        at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.representData(SafeRepresenter.java:304)
        at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)
        at org.yaml.snakeyaml.representer.BaseRepresenter.represent(BaseRepresenter.java:64)
        at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:242)
        at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:206)
        at org.yaml.snakeyaml.Yaml.dump(Yaml.java:181)
        at org.bukkit.configuration.file.YamlConfiguration.saveToString(YamlConfiguration.java:39)
        at org.bukkit.configuration.file.FileConfiguration.save(FileConfiguration.java:68)
        at me.armar.plugins.autorank.data.SimpleYamlConfiguration.save(SimpleYamlConfiguration.java:97)
        at me.armar.plugins.autorank.internalproperties.InternalProperties.setCachedLeaderboard(InternalProperties.java:66)
        at me.armar.plugins.autorank.leaderboard.Leaderboard.updateLeaderboard(Leaderboard.java:301)
        at me.armar.plugins.autorank.playtimes.Playtimes$2.run(Playtimes.java:564)
        at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftTask.run(CraftTask.java:71)
        at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
        ... 3 more