XStream : duplicate filed exception

XStream : duplicate filed exception

<staging>
<stage>
<name>aaaa</name>
<taskName>aa</taskName>
<taskName>qwe</taskName>
<taskName>qwe</taskName>
<iconName>asdad</iconName>
<iconName>dasd</iconName>
</stage>
<stage>
<name>dasda</name>
<taskName>asdak</taskName>
<taskName>dasdk1</taskName>
<taskName>dasdask2</taskName>
<iconName>dasdn</iconName>
<iconName>dasdcon</iconName>
</stage>
</staging>
And this is my java class :
@XStreamAlias("stage")
public class Stage {
private String name;
private List<String> taskName;
private List<String> iconName;
}
I am using XStream 1.4.2 to convert that XML data to Java object.
I have seen couple of SO posts but still it does not solve my problem.
Its throwing following exception:
com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$DuplicateFieldException:
Duplicate field taskName
---- Debugging information ----
field : taskName
class : com.thbs.soaconnect.model.configuration.Stage
required-type : com.thbs.soaconnect.model.configuration.Stage
converter-type :
com.thoughtworks.xstream.converters.reflection.ReflectionConverter
path : /soaConnect/staging/stage/taskName[2]
line number : 28
class[1] : java.util.ArrayList
converter-type[1] :
com.thoughtworks.xstream.converters.collections.CollectionConverter
class[2] : com.thbs.soaconnect.model.configuration.Configuration
version : null
Can you please help me.