unable to unmarshall in XML deserializer

Hello, not always but almost always it happens to me that the XML deserializer doesn't work even if the XML is valid (controlled the output using external tools). This happens when I try to find a customer by Id using the DataService. I'm using the last version of the SDK (6.2.3)

this is the Exception stacktrace
`ERROR com.intuit.logger - unable to unmarshall in XML deserializer s 1
javax.xml.bind.JAXBException: Provider com.sun.xml.internal.bind.v2.ContextFactory could not be instantiated: javax.xml.bind.JAXBException: "com.intuit.ipp.data" doesnt contain ObjectFactory.class or jaxb.index
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:146)
at javax.xml.bind.ContextFinder.find(ContextFinder.java:356)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:431)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:394)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:298)
at com.intuit.ipp.serialization.XMLSerializer.deserializeData(XMLSerializer.java:82)
at com.intuit.ipp.serialization.XMLSerializer.deserialize(XMLSerializer.java:71)
at com.intuit.ipp.interceptors.DeserializeInterceptor.execute(DeserializeInterceptor.java:79)
at com.intuit.ipp.interceptors.IntuitInterceptorProvider.executeResponseInterceptors(IntuitInterceptorProvider.java:114)
at com.intuit.ipp.interceptors.IntuitInterceptorProvider.executeInterceptors(IntuitInterceptorProvider.java:87)
at com.intuit.ipp.services.DataService.executeInterceptors(DataService.java:159)
at com.intuit.ipp.services.DataService.findById(DataService.java:273)`