Could you please help me. I have got next error message from web service:

Error Number: -2146233088
Source: IASystems.IAInterface.IAPathwaysDriver
Description: Server was unable to process request. --> There is an error in XML document (1, 418). --> The specified type was not recognized: name='string', namespace='http://schemas.xmlsoap.org/soap/encoding/', at <missingMessages xmlns=''>.
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at IASystems.IAInterface.IAPathwaysDriver.Pathways.SetLoanDisburseMain.MbrInfoBySSP(String USERNAME, String PASSWORD, String TELLERID, String TELLER_STATION_ID, String ACCOUNT_NUMBER, String SURNAME, String NEW_CHG_INQUIRY, String MEMBER_FIRST, String MEMBER_MIDDLE, String MEMBER_LAST, String SSN, String ADDRESS_LINE_1, String ADDRESS_LINE_2, String AFFINITY_CODE, String ADDRESS_LINE_3, String RESIDENCE_CODE, String W, String CITY, String STATE, String ZIP_CODE, String COUNTRY_CODE, String HOME_PH_NBR_A_C, String HOME_PH_NBR, String WORK_PHONE_AC, String WORK_PH_NBR, String FAX_PHONE_AC, String FAX_PHONE, String E_MAIL, String HOUSE, String MAIDEN_NAME, String H, String DRIVER_LIC_NUM, String DRIVER_LIC_STAT, String BIRTHDATE, String CUSTID, String OWNERSHIP_CD, String CLASS_CODE, String JT_OWNER_NAME, String CURR_BRANCH, String ORIG_BRANCH, String SELLER, String ESCHEAT_DATE, String DEPARTMENT, String EMPLOYEE_NBR, String PLDG_AMOUNT, String INS_CODE, String REF_FIELD, String REF2_FIELD, String REF3_FIELD, String REF4_FIELD, String USER_DATE, String CRED_REPORT, String MBR_PASSWORD, String PROXY_DATE, String SEX_CODE, String RACIAL_ORIGIN, String YTD_INTEREST, String PAYROLL_GRP, String C24_LOCKOUT, String STATEMENT_CYCLE, String PYMT_HISTORY, String ACCESS_CLASS)
at IASystems.IAInterface.IAPathwaysDriver.clsPathways.Lookup(String ID, String SurName, LookupType LookupKey)