I am working on my first outbound message api integration and it seems I need some apex to assist with this. I have the following class:

//Methods Included: GoToState, GetStateAndServicesList
// Primary Port Class Name: BasicHttpBinding_IStateService  
public class nphaseComUnifiedwebserviceV2 {
    public class BasicHttpBinding_IStateService {
        public String endpoint_x = 'https://uws.apps.nphase.com/api/v2/StateService.svc?wsdl';
        public Map<String,String> inputHttpHeaders_x;
        public Map<String,String> outputHttpHeaders_x;
        public String clientCertName_x;
        public String clientCert_x;
        public String clientCertPasswd_x;
        public Integer timeout_x;
        private String[] ns_map_type_info = new String[]{'http://nphase.com/unifiedwebservice/v2','nphaseComUnifiedwebserviceV2','http://schemas.microsoft.com/2003/10/Serialization/','schemasMicrosoftCom200310Serializat','http://schemas.datacontract.org/2004/07/NPhase.UnifiedWebService.APIs.v2.Contract.StateService','schemasDatacontractOrg200407NphaseU','http://schemas.datacontract.org/2004/07/NPhase.UnifiedWebService.APIs.v2.Contract.Common','schemasDatacontractOrg200407NphaseU1','http://schemas.microsoft.com/2003/10/Serialization/Arrays','schemasMicrosoftCom200310Serializat1'};

        public nphaseComUnifiedwebserviceV2.GetStateAndServicesListResponse_element GetStateAndServicesList(schemasDatacontractOrg200407NphaseU.GetStateAndServicesListRequest Input) {
            nphaseComUnifiedwebserviceV2.GetStateAndServicesList_element request_x = new nphaseComUnifiedwebserviceV2.GetStateAndServicesList_element();
            nphaseComUnifiedwebserviceV2.GetStateAndServicesListResponse response_x;
            request_x.Input = Input;
            Map<String, nphaseComUnifiedwebserviceV2.GetStateAndServicesListResponse> response_map_x = new Map<String, nphaseComUnifiedwebserviceV2.GetStateAndServicesListResponse>();
            response_map_x.put('response_x', response_x);
            WebServiceCallout.invoke(
                this,
                request_x,
                response_map_x,
                new String[]{endpoint_x,
                'http://nphase.com/unifiedwebservice/v2/IStateService/GetStateAndServicesList',
                'http://nphase.com/unifiedwebservice/v2',
                'GetStateAndServicesList',
                'http://nphase.com/unifiedwebservice/v2',
                'GetStateAndServicesListResponse',
                'nphaseComUnifiedwebserviceV2.GetStateAndServicesListResponse'}
            );
            response_x = response_map_x.get('response_x');
            return response_x;
        }

        public nphaseComUnifiedwebserviceV2.GoToStateResponse_element GoToState(schemasDatacontractOrg200407NphaseU.GoToStateRequest Input) {
            nphaseComUnifiedwebserviceV2.GoToState_element request_x = new nphaseComUnifiedwebserviceV2.GoToState_element();
            nphaseComUnifiedwebserviceV2.GoToStateResponse response_x;
            request_x.Input = Input;
            Map<String, nphaseComUnifiedwebserviceV2.GoToStateResponse> response_map_x = new Map<String, nphaseComUnifiedwebserviceV2.GoToStateResponse>();
            response_map_x.put('response_x', response_x);
            WebServiceCallout.invoke(
                this,
                request_x,
                response_map_x,
                new String[]{endpoint_x,
                'http://nphase.com/unifiedwebservice/v2/IStateService/GoToState',
                'http://nphase.com/unifiedwebservice/v2',
                'GoToState',
                'http://nphase.com/unifiedwebservice/v2',
                'GoToStateResponse',
                'nphaseComUnifiedwebserviceV2.GoToStateResponse'}
            );
            response_x = response_map_x.get('response_x');
            return response_x;
        }
    }
    public class GetStateAndServicesList_element {
        public schemasDatacontractOrg200407NphaseU.GetStateAndServicesListRequest Input;
        private String[] Input_type_info = new String[]{'Input','http://nphase.com/unifiedwebservice/v2','GetStateAndServicesListRequest','0','1','true'};
        private String[] apex_schema_type_info = new String[]{'http://nphase.com/unifiedwebservice/v2','true','false'};
        private String[] field_order_type_info = new String[]{'Input'};
    }
    public class GetStateAndServicesListResponse_element {
        public nphaseComUnifiedwebserviceV2.GetStateAndServicesListResponse Output;
        private String[] Output_type_info = new String[]{'Output','http://nphase.com/unifiedwebservice/v2','GetStateAndServicesListResponse','0','1','true'};
        private String[] apex_schema_type_info = new String[]{'http://nphase.com/unifiedwebservice/v2','true','false'};
        private String[] field_order_type_info = new String[]{'Output'};
    }
    public class GoToState_element {
        public schemasDatacontractOrg200407NphaseU.GoToStateRequest Input;
        private String[] Input_type_info = new String[]{'Input','http://nphase.com/unifiedwebservice/v2','GoToStateRequest','0','1','true'};
        private String[] apex_schema_type_info = new String[]{'http://nphase.com/unifiedwebservice/v2','true','false'};
        private String[] field_order_type_info = new String[]{'Input'};
    }
    public class GoToStateResponse_element {
        public nphaseComUnifiedwebserviceV2.GoToStateResponse Output;
        private String[] Output_type_info = new String[]{'Output','http://nphase.com/unifiedwebservice/v2','GoToStateResponse','0','1','true'};
        private String[] apex_schema_type_info = new String[]{'http://nphase.com/unifiedwebservice/v2','true','false'};
        private String[] field_order_type_info = new String[]{'Output'};
    }
}


And I am receiving the following error:
Error: Compile Error: Invalid type: nphaseComUnifiedwebserviceV2.GetStateAndServicesListResponse at line 16 column 13

Anyone have any solutions or suggestions?

Thanks
Jerry