Question regarding iPhone error -

when run below code gives response on device....

- (void) requestproductdata {  //  nsstring *str = [[nsstring alloc] initwithformat:@"com.mycompany.inapppurchasetesting.productid"];//same product id displayed in itunes connect//"];    skproductsrequest *request= [[skproductsrequest alloc] initwithproductidentifiers:[nsset setwithobject:str]];    request.delegate = self;   [request start];  //  //nsset *productids = [nsset setwithobjects:@"com.mycompany.inapppurchasetesting.productid", nil];   //skproductsrequest *request = [[skproductsrequest alloc] initwithproductidentifiers:productids];   //request.delegate = self;   nslog(@"requesting");   //[request start]; }  - (void)productsrequest:(skproductsrequest *)request didreceiveresponse:(skproductsresponse *)response {     nsarray *myproduct = response.products;   nsarray *myinvalidproducts = response.invalidproductidentifiers;   nslog(@"did recieve response");      nslog(@"response count %d",response.products.count);  nslog(@"invalid response count %d",response.invalidproductidentifiers.count);   (int = 0; i<myproduct.count; i++)  {   nslog(@"t:%@",[[myproduct objectatindex:i] localizedtitle]);  }   for(int = 0; < myinvalidproducts.count; ++i)  {   nslog(@"invalid products:%@",[[myinvalidproducts objectatindex:i] localizedtitle]);     }   // populate ui  [request autorelease]; } 

2010-11-16 14:14:46.028 inapppurchasetesting[7357:307] view loaded

2010-11-16 14:14:46.164 inapppurchasetesting[7357:307] requesting

2010-11-16 14:14:46.196 inapppurchasetesting[7357:307] can make payments

2010-11-16 14:14:52.135 inapppurchasetesting[7357:307] did recieve response

2010-11-16 14:14:52.146 inapppurchasetesting[7357:307] response count 0

2010-11-16 14:14:52.152 inapppurchasetesting[7357:307] invalid response count 1

2010-11-16 14:14:52.160 inapppurchasetesting[7357:307] -[nscfstring localizedtitle]: unrecognized selector sent instance 0x114990

2010-11-16 14:14:52.181 inapppurchasetesting[7357:307] * terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[nscfstring localizedtitle]: unrecognized selector sent instance 0x114990'

why above error occurs...

please guide me out...

because invalidproductidentifiers contains array of nsstrings, not skproducts.

see storekit documentation.

nslog(@"invalid products:%@",[myinvalidproducts objectatindex:i]);