ios - replace object at indexPath - big array with 12 sections -

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i have array 12 sections , need replace value @ index. test code: 

nsmutablearray *hm = [[nsmutablearray alloc] initwithobjects:@{@"first": @[@"test1", @"test2"]}, @{@"second": @[@"test1"]}, nil];  nslog(@"%@", [hm valueforkey:@"first"][0][0] );  [[hm valueforkey:@"first"][0] replaceobjectatindex:0 withobject:@"lol"];  nslog(@"%@", hm);

first nslog returns : test1 - ok

when replace - crash -[__nsarrayi replaceobjectatindex:withobject:]: unrecognized selector sent instance 0x7fde53d2f700

i need change test1 something.

wha doing wrong please?

nsmutablearray *hm = [[nsmutablearray alloc] initwithobjects:@{@"first": @[@"test1", @"test2"]}, @{@"second": @[@"test1"]}, nil];      nslog(@"%@", [hm valueforkey:@"first"][0][0] );      //your inner array immutable, change mutable , replace object, that's it.     nsmutablearray *array = [[hm valueforkey:@"first"][0] mutablecopy];     [array replaceobjectatindex:0 withobject:@"lol"];     [hm replaceobjectatindex:0 withobject:array];      nslog(@"%@", hm);

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