NSMutableDictionary setting value causes crash - 


nsmutabledictionary             *firstcurr;  nslog(@"currency list count=%d",[self.currencylist count]);  (int j=0; j<[self.currencylist count]; j++) { nslog(@"j=%d",j); firstcurr                   =   [self.currencylist objectatindex:j]; [firstcurr                      setvalue:[nsnumber numberwithfloat:     [[currencyitems objectatindex:j]floatvalue]] forkey:kselectedcurrencyinr]; }

i have array of nsmutabledictionary objects called currency list, trying set 1 field of nsmutabledictionary. accessing firstcurr in marked line causes crash! 

nsmutablearray                          *arr; arr                                 =   [[[nsmutablearray alloc] init] autorelease];  [[nsuserdefaults standarduserdefaults]  setobject:arr forkey:kselectedcurrencies];

this how add in array

nsdictionary *dict = [[[nsmutabledictionary alloc] init] autorelease];  [dict setvalue:countrycode[pos] forkey:kselectedcurrencycode]; [dict setvalue:countryname[pos] forkey:kselectedcurrencycountry]; [dict setvalue:[nsnumber numberwithfloat:2.0] forkey:kselectedcurrencyinr]; [dict setvalue:currencyname[pos] forkey:kselectedcurrencyname]; [temp addobject:dict]; [[nsuserdefaults standarduserdefaults] setobject:temp forkey:kselectedcurrencies]; [[nsuserdefaults standarduserdefaults] synchronize];


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