IllegalArgumentException using iControl 11.1 Java

We are using the iControl-11.1.0 Java library to interface with LTM version 11.5.1 Build 4.0.128 Hotfix HF4. Whenever we're trying to call LocalLB.PoolMember.get_all_statistics we are getting the following exception; all other calls seems to be working fine.

Any ideas what might be causing this issue? Since iControl-11.1 have the same major branch (11.x) as BigIp 11.5.1 shouldn't these be compatible?

ERROR 2015-01-05 06:15:02,797 Call schedulerFactoryBean_Worker-9 Exception:
org.xml.sax.SAXException
java.lang.IllegalArgumentException
        at org.apache.axis.encoding.ser.SimpleDeserializer.onEndElement(SimpleDeserializer.java:176)
        at org.apache.axis.encoding.DeserializerImpl.endElement(DeserializerImpl.java:502)
        at org.apache.axis.encoding.DeserializationContext.endElement(DeserializationContext.java:1087)
        at org.apache.axis.message.SAX2EventRecorder.replay(SAX2EventRecorder.java:171)
        at org.apache.axis.message.MessageElement.publishToHandler(MessageElement.java:1141)
        at org.apache.axis.message.RPCElement.deserialize(RPCElement.java:236)
        at org.apache.axis.message.RPCElement.getParams(RPCElement.java:384)
        at org.apache.axis.client.Call.invoke(Call.java:2467)
        at org.apache.axis.client.Call.invoke(Call.java:2366)
        at org.apache.axis.client.Call.invoke(Call.java:1812)
        at iControl.LocalLBPoolMemberBindingStub.get_all_statistics(LocalLBPoolMemberBindingStub.java:905)
        ...
Caused by: java.lang.IllegalArgumentException
        at iControl.CommonStatisticType.fromValue(CommonStatisticType.java:1579)
        at iControl.CommonStatisticType.fromString(CommonStatisticType.java:1584)
        at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.apache.axis.encoding.ser.EnumDeserializer.makeValue(EnumDeserializer.java:53)
        at org.apache.axis.encoding.ser.SimpleDeserializer.onEndElement(SimpleDeserializer.java:172)
        ... 24 more