crash while removing objects from NSMutableArray

Question

In my iphone project (ARC enabled) i have a nsmuatble array which contains some 5 managed objects (which are retrieved from core data ) and in some scenario i n

Answer 1

This:

[__NSArrayI removeObject:] : unrecognized selector sent to instance 0xa391640

indicates that your array "surveys" is NSArray (not-mutable). Are you sure you have initialized it properly? If you do it by an assignment like this

NSMutableArray* surveys = [someManagedObjectContext executeFetchRequest:request]

an array "surveys" will be of type NSArray because Core Data fetch requests return NSArrays.