CRM 4.0 - ERROR programatically re-opening a closed Incident/Case with javaMSCRM

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CRM

SDK

I need to programatically re-open an Incident/Case that has been closed.
With a plugin in java (javaMSCRM).

My code:

SetStateIncidentRequest request = SetStateIncidentRequest.Factory.newInstance();

request.setIncidentState(IncidentState.ACTIVE);

request.setIncidentStatus(IncidentStateInfo.INT_ACTIVE);

Guid guid = Guid.Factory.newInstance();
guid.setStringValue(incident.getIncidentid().getStringValue());
request.xsetEntityId(guid);

ExecuteDocument executeDocument = ExecuteDocument.Factory.newInstance();
Execute execute = executeDocument.addNewExecute();
execute.setRequest(request);

WSGRECOSingleton.stub.execute(executeDocument, WSGRECOSingleton.crmAuthenticationTokenDocument, null, null);

This code return the next ERROR:
Error en el documento XML (1, 722). ---> No se esperaba < EntityId xmlns='http://schemas.microsoft.com/crm/2007/WebServices'>