unrecognized selector sent to instance

Question

I'm using appDelegate for sharing NSMutableArray but it's crashing. Error message is:

unrecognized selector sent to instance

My code is:

countrydata *countryobj=(countrydata *)[listItems objectAtIndex:indexPath.row];

if(addItems==nil)
{
    addItems=[[NSMutableArray alloc]init];
}
[addItems addObject:countryobj];

callAppDelegate *appDelegate = (callAppDelegate *)[[UIApplication sharedApplication] delegate];
appDelegate.AddItems=addItems;

[self dismissModalViewControllerAnimated:YES];

Where is my code is wrong? appdelegate.AddItems is NSMutableArray and already declare in callAppDelegate.h. I already import callAppDelegate.h in top.

Which line does the error occur on? That error message means you are sending a message to an object which does not have that message declared. Possible memory leak with addItems there as well btw — willcodejavaforfood, Oct 05 '10 at 07:28
appDelegate.AddItems=addItems; is error occur. I can't parse the value to appDelegate. — saturngod, Oct 05 '10 at 07:29
Your variable and class naming-"scheme" is really confusing. Some of your variables start with capital letters and some with small letters. The same applies to your class-names. This will get you in big trouble if your projects start to grow. — Matthias Bauch, Oct 05 '10 at 07:40
Totally agree with fluchpunkt, suggest you read some best practices about programming :) — Manny, Oct 05 '10 at 07:41

score 2 · Accepted Answer · edited Apr 10 '13 at 14:26

If the error occurred at appDelegate.AddItems=addItems then you might have forgotten to synthesize it.

You should add
@synthesize AddItems;
after @implementation in your *appDelegate.m

This assumes that you've already declared it @property (nonatomic, retain / assign) in your header file (.h)

[update] Minor comment if you did declare it as @property (nonatomic, retain) then you should release addItems after setting it to a retained property because it will cause memory leak.

E.g.

appDelegate.AddItems=addItems;
[addItems release];

unrecognized selector sent to instance

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