NSInvalidArgumentException, reason unrecognized selector sent to instance - ios

Question

When processing a json response I a get the below error:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[DADGList setDescription:]:
unrecognized selector sent to instance 0x7ae88880'
The class it crashed on:
#implementation DADGList
-(id)copy
{
DADGList *list = [[DADGList alloc] init];
list.identifier = self.identifier;
list.name = [self.name copy];
list.description = [self.description copy];
list.created = [self.created copy];
list.itemCount = self.itemCount;
list.shareLink = [self.shareLink copy];
return list;
}
+(DADGList *)listFromDictonary:(NSDictionary *)dictonary
{
DADGList *list = [[DADGList alloc] init];
NSLog( #"%#", dictonary );
list.identifier = [[dictonary objectForKey:#"list_id"] integerValue];
list.itemCount = [[dictonary objectForKey:#"list_items_count"] integerValue];
list.name = [NSString stringWithString:[dictonary objectForKey:#"list_name"]];
list.description = [NSString stringWithString:[dictonary objectForKey:#"list_description"]];
list.created = [[NSDate alloc] initWithTimeIntervalSince1970:[[dictonary objectForKey:#"list_created"] doubleValue]];
list.shareLink = [NSString stringWithString:[dictonary objectForKey:#"list_share_url"]];
return list;
}
and the dictonary that is past to listFromDictonary:

Answer 1

You should rename your description property for something else as this is a field already existing in the iOS echosystem (NSObject if I am not mistaken) and that creates all sort of weird crash like this.

Answer 2

If you are using core data maybe you need to implement the following instance:
Mall(entity: NSEntityDescription.entity(forEntityName: "Mall", in: context)!, insertInto: nil)
Where Mall is my entity and context is my view context.