objective c - Terminating app due to uncaught exception 'NSInvalidArgumentException' 5 -

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i getting error while running app: code is:

- (ibaction)yes:(id)sender {     uialertview *msgbox=[[uialertview alloc]initwithtitle:@"warrning" message:nil delegate:self cancelbuttontitle:@"ok" otherbuttontitles:nil, nil];     if ([_usernametextbox.text length]>0)     {         if ([_passwordtextfield.text length]>0)         {             nsmutablestring *ms=[[nsmutablestring alloc]initwithformat:url,_usernametextbox.text,_passwordtextfield];             nsurl *serviceurl=[[nsurl alloc] initwithstring:ms];             nserror *error=nil;             nsdata *data=[nsdata datawithcontentsofurl:serviceurl options:nsdatareadinguncached error:&error];             nsmutabledictionary *dic=[[nsmutabledictionary alloc]init];             nsstring *jsondata=[[nsstring alloc] initwithdata:data encoding:nsutf8stringencoding];             sbjson *parsedata=[[sbjson alloc] init];             dic=[parsedata objectwithstring:jsondata error:nil];             if([dic count]>0)             {                 nsmutablestring *st=[[nsmutablestring alloc]initwithstring:[dic objectforkey:@"loginresult:@""+"]]; //@" " withstring:@"+"                 if ([st isequaltostring:@"yes"])                 {                     uialertview * alert=[[uialertview alloc] initwithtitle:@"accept" message:@"correct username" delegate:nil cancelbuttontitle:@"ok" otherbuttontitles:nil, nil];                     [alert show];                   }                 else                 {                     uialertview * alert=[[uialertview alloc] initwithtitle:@"error" message:@"invalid username , password" delegate:nil cancelbuttontitle:@"ok" otherbuttontitles:nil, nil];                     [alert show];                  }             }         }         else         {             msgbox.message=@"please enter password...";             [msgbox show];         }     }     else     {         msgbox.message=@"please enter username...";         [msgbox show];   }

i error:

terminating app due uncaught exception 'nsinvalidargumentexception', reason: '* -[nsconcretedata initwithcontentsofurl:options:error:]: nil url argument'

on line: 

nsmutablestring *st=[[nsmutablestring alloc]initwithstring:[dic objectforkey:@"loginresult:@""+"]]; //@" " withstring:@"+" if ([st isequaltostring:@"yes"])


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