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java.lang.NullPointerException: 	at org.yaml.snakeyaml.emitter.Emitter.expectNode(Emitter.java:400)	at org.yaml.snakeyaml.emitter.Emitter.access$1600(Emitter.java:62)	at org.yaml.snakeyaml.emitter.Emitter$ExpectBlockMappingSimpleValue.expect(Emitter.java:641)	at org.yaml.snakeyaml.emitter.Emitter.emit(Emitter.java:216)	at org.yaml.snakeyaml.serializer.Serializer.serializeNode(Serializer.java:208)	at org.yaml.snakeyaml.serializer.Serializer.serializeNode(Serializer.java:206)	at org.yaml.snakeyaml.serializer.Serializer.serialize(Serializer.java:112)	at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:243)	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)