java.lang.reflect.InvocationTargetException: This exception has no message.

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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)

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