objective c - Reverse Geocoding using google maps api iOS -

i doing reverse geocoding using following code

- (void)locationmanager:(cllocationmanager *)manager didupdatetolocation:(cllocation *)newlocation fromlocation:(cllocation *)oldlocation     {        curloc=newlocation;     if (curloc != nil) {         latitude=curloc.coordinate.latitude;         longitude=curloc.coordinate.longitude;         //[self loadmap:latitude second:longitude];         [self markerpoint:latitude+0.04 second:longitude+0.1 third:latitude-0.04 forth:longitude-0.1];          nserror *error;         nsstring *lookupstring = [nsurl urlwithstring:[nsstring stringwithformat:@"http://maps.googleapis.com/maps/api/geocode/json?latlng=%f,%f&sensor=false",latitude,longitude]];         nslog(@"url: %@",lookupstring);         lookupstring = [lookupstring stringbyreplacingoccurrencesofstring:@" " withstring:@"+"];          nsdata *jsonresponse = [nsdata datawithcontentsofurl:[nsurl urlwithstring:lookupstring]];          nsdictionary *jsondict = [nsjsonserialization jsonobjectwithdata:jsonresponse options:kniloptions error:&error];          self.locationarray = [[jsondict valueforkey:@"results"] valueforkey:@"formatted_address"];         int total = self.locationarray.count;         nslog(@"locationarray count: %d", self.locationarray.count);          (int = 0; < total; i++)         {             nsstring *statusstring = [jsondict valueforkey:@"status"];             nslog(@"json response status:%@", statusstring);             nslog(@"address: %@", [self.locationarray objectatindex:i]);         }     } }     

now getting error :

*** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[nsurl stringbyreplacingoccurrencesofstring:withstring:]: unrecognized selector sent instance 0xbce98c0' *** first throw call stack: (     0   corefoundation                      0x034551e4 __exceptionpreprocess + 180     1   libobjc.a.dylib                     0x031a98e5 objc_exception_throw + 44     2   corefoundation                      0x034f2243 -[nsobject(nsobject) doesnotrecognizeselector:] + 275     3   corefoundation                      0x0344550b ___forwarding___ + 1019     4   corefoundation                      0x034450ee _cf_forwarding_prep_0 + 14     5   matchpoint                          0x00017fad -[icsviewcontroller locationmanager:didupdatetolocation:fromlocation:] + 813     6   corelocation                        0x0164655e cllocationcoordinate2dgetdistancefrom + 18294     7   corelocation                        0x01645af4 cllocationcoordinate2dgetdistancefrom + 15628     8   corelocation                        0x01642e40 cllocationcoordinate2dgetdistancefrom + 4184     9   corelocation                        0x0163c680 clclientinvalidate + 996     10  corefoundation                      0x034140b0 __cfrunloop_is_calling_out_to_a_block__ + 16     11  corefoundation                      0x033dd339 __cfrunloopdoblocks + 361     12  corefoundation                      0x033fb753 __cfrunlooprun + 2355     13  corefoundation                      0x033fa9d3 cfrunlooprunspecific + 467     14  corefoundation                      0x033fa7eb cfrunloopruninmode + 123     15  graphicsservices                    0x051f05ee gseventrunmodal + 192     16  graphicsservices                    0x051f042b gseventrun + 104     17  uikit                               0x01e69f9b uiapplicationmain + 1225     18  matchpoint                          0x0001d9fd main + 141     19  libdyld.dylib                       0x03d206d9 start + 1     20  ???                                 0x00000001 0x0 + 1 ) libc++abi.dylib: terminating uncaught exception of type nsexception (lldb)  

provide valid latitude , longitude static , check first. after got success use dynamic latitude , longitude

-(void)getgoogleadrressfromlatlong : (cgfloat)lat lon:(cgfloat)lon{     //[self showloadingview:@"loading.."];     nserror *error = nil;      nsstring *lookupstring  = [nsstring stringwithformat:@"http://maps.googleapis.com/maps/api/geocode/json?latlng=%f,%f&sensor=false", lat,lon];      lookupstring = [lookupstring stringbyreplacingoccurrencesofstring:@" " withstring:@"+"];      nsdata *jsonresponse = [nsdata datawithcontentsofurl:[nsurl urlwithstring:lookupstring]];      nsdictionary *jsondict = [nsjsonserialization jsonobjectwithdata:jsonresponse options:kniloptions error:&error];     // nslog(@"%@",jsondict);      nsarray* jsonresults = [jsondict objectforkey:@"results"];     // nslog(@"%@",jsonresults);  }