Exception when deploying Web service : "Two classes have the same XML type name"

Issue

• "Two classes have the same XML type name" exception when deploying web service:

        Caused by: com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions
        Two classes have the same XML type name "{http://com.company.webservice.com/}createAccountResponse". Use @XmlType.name and @XmlType.namespace to assign different names to them.
         this problem is related to the following location:
         at com.company.webservice.account.message.CreateAccountResponse
         at private com.company.webservice.account.message.CreateAccountResponse com.company.webservice.jaxws.CreateAccountResponse._return
         at com.company.webserivce.jaxws.CreateAccountResponse
         this problem is related to the following location:
         at com.company.webservice.jaxws.CreateAccountResponse
        ...
        at com.sun.xml.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:102)
         at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:448)
         at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:297)
         at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:139)
         at com.sun.xml.bind.api.JAXBRIContext.newInstance(JAXBRIContext.java:105)
         at org.jboss.ws.core.jaxws.CustomizableJAXBContextFactory.createContext(CustomizableJAXBContextFactory.java:108)
         ... 40 more

• The following is my web service code:

@Stateless
@WebService()
public class AccountWS {
@WebMethod()
public CreateAccountResponse createAccount(@WebParam(name = "request") CreateAccountRequest request)
 {
   return null;
 }
}