wait_fences: failed to receive reply: 10004003 error – UIAlert WITHOUT UITextField present

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The reason for this wait_fences: failed to receive reply: can also be that you try to show an alert while not being on the mainThread (which is the GUI thread).

Dispatching to the GUI thread helps:

dispatch_async(dispatch_get_main_queue(), ^{ 
  [mainAlert show];
});

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