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I wrote it according to the official demo, then compile executable, appeared the following error

enter image description here

Pang
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Jian Liao
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    Please post actual error messages instead of screenshots. [See here](http://meta.stackoverflow.com/a/285557/1402846) for details. Thank you. – Pang Jan 26 '16 at 03:04
  • Possible duplicate of http://stackoverflow.com/questions/19213782/undefined-symbols-for-architecture-arm64 – adjuremods Jan 27 '16 at 01:43
  • Did you install the Cocoapods? Did you make sure to open the Xcode workspace, not the Xcode project? – user102008 Jan 28 '16 at 05:15

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