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error on webservices

Hi i am new apex and web services.


i am trying to getresponse from webserivces but i am getting error like below,


System.NullPointerException: Attempt to de-reference a null object

Class.smk.tempuriOrgTaxwareserviceTaxwareservic.TaxwareServiceSoap.OpenFiles: line 114, column 41 Class.smk.openfiledemo.getresponse: line 18, column 12 External entry point


and my class is


public class openfiledemo{

Account acc;
tempuriOrgTaxwareserviceTaxwareservic.TaxwareServiceSoap stub =
       new tempuriOrgTaxwareserviceTaxwareservic.TaxwareServiceSoap();   

String response;

public openfiledemo(ApexPages.StandardController stdcontroller){

this.acc = (Account)stdController.getRecord();

public String getresponse(){

response = stub.OpenFiles();
system.debug('Test Reponse>>>>>>>>>>>>>>>>>>>>>>>'+response);                                                    
return response;




and wsdl class line 114 is


system.debug('output is>>>>>>>>>>'+ response_x.OpenFilesResult);

thank you