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java.lang.NullPointerException: Nodes must be provided.	at org.yaml.snakeyaml.nodes.NodeTuple.(NodeTuple.java:28)	at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:163)	at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.representData(SafeRepresenter.java:304)	at org.bukkit.configuration.file.YamlRepresenter$RepresentConfigurationSection.representData(YamlRepresenter.java:23)	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)	at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:156)	at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.representData(SafeRepresenter.java:304)	at org.bukkit.configuration.file.YamlRepresenter$RepresentConfigurationSection.representData(YamlRepresenter.java:23)	at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepresenter.java:94)	at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseRepresenter.java:156)	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:40)	at org.bukkit.configuration.file.FileConfiguration.save(FileConfiguration.java:103)	at me.NoChance.PvPManager.Managers.ConfigManager$2.run(ConfigManager.java:144)	at java.lang.Thread.run(Thread.java:745)