objective c - iOS Cocoa NSArrayI length]: unrecognized selector sent to instance -

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i trying determine causing error:

2014-06-08 20:40:44.076 database[8656:70b] -[__nsarrayi length]: unrecognized selector sent instance 0x8a44050

here code.

nsdictionary* json = [nsjsonserialization jsonobjectwithdata:responsedata options:0 error:&error];

this breaking point error occurs: nslog([json allkeys]);

sample of json being used input:

{"1":{"key":"1","contentone":"aaa","contenttwo":"testing"},"2":{"key":"2","contentone":"bbb","contenttwo":null},"3":{"key":"3","contentone":"ccc","contenttwo":"testing"}}

[json allkeys] returns nsarray, while nslog expects formatting string. try this:

nslog(@"%@", [json allkeys]);

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