java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.thoughtworks.xstream.converters.reflection.FieldDictionary.buildMap(FieldDictionary.java:128)
at com.thoughtworks.xstream.converters.reflection.FieldDictionary.fieldOrNull(FieldDictionary.java:113)
at com.thoughtworks.xstream.converters.reflection.FieldDictionary.field(FieldDictionary.java:92)
at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.getField(PureJavaReflectionProvider.java:181)
at com.thoughtworks.xstream.mapper.AttributeMapper.addAttributeFor(AttributeMapper.java:169)
at com.thoughtworks.xstream.XStream.useAttributeFor(XStream.java:1226)
at com.thoughtworks.xstream.XStream.aliasAttribute(XStream.java:1192)
at myproject.XstreamSerializer.(XstreamSerializer.java:43)

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