objective c - Venmo iOS sdk crashing application, when Venmo returning back to app after login to Venmo from safari -

i using venmo ios sdk in application, have done pod file installation , all. have venmo app id , secret key, using same able login venmo sample app provided venmo, if use same app id , secret key in application getting crashed in "startloading" method in "venurlprotocol.m" class. getting '[nsurl querydictionary]: unrecognized selector sent instance' error.

below method in app crashing.this method gets executed after clicking on allow button on venmo login page. (in safari)

` -(void)startloading {  nsstring *host = [self.request.url host];  nslog(@"self.request.url = %@",self.request.url);  nsdictionary *querydictionary = [self.request.url querydictionary];//application crashing here  if ([host isequaltostring:@"oauth"]) {      nsstring *oautherrorcode = [querydictionary valueforkey:@"error"];      if (oautherrorcode) {         nsstring *oautherrormessage = querydictionary[@"message"] ?: @"";         nserror *oautherror = [nserror errorwithdomain:venmosdkdomain                                                   code:vensdkerrortransactionfailed                                            description:oautherrormessage                                     recoverysuggestion:@"please try again."];         if ([venmo sharedinstance].oauthcompletionhandler) {             [venmo sharedinstance].oauthcompletionhandler(no, oautherror);         } 

`

help me if has used venmo ios sdk , faced kind of error.

thanks in advance.