NSMutableArray init with getValue from Operation result

Question

i want to get back a return value (NSMutableArray) after an operation...

    [queue addOperation:operation];       
    [operation waitUntilFinished];
    [[operation result] getValue:&ParseAndCompare_result];   <<here is the error

[__NSArrayM getValue:]: unrecognized selector sent to instance 0x1b0010

how can i init this emtpy NSMutableArray with the new data i receive....?

regards

Answer 1

ParseAndCompare_result = [operation result];