-[__NSCFConstantString ascending]: unrecognized selector sent to instance 0x15

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I am getting a strange error. When I am trying to sort an array..

- (NSArray *)sortItemsUsingDescriptor:(NSSortDescriptor *)descriptor
{

        NSArray *descriptors = [NSArray arrayWithObject:descriptor];

//This line is where the exception occurs
  NSArray *sortedArray = [self.unsortedArray sortedArrayUsingDescriptors:descriptors]; 

            return sortedArray;
}

And yes, all the objects of the 'unsortedArray' has the property specified in the descriptor. Any ideas?

asked 33 secs ago

Gokul

123

-[__NSCFConstantString ascending]: unrecognized selector sent to instance 0x15