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Often when my Macbook Pro Retina has been asleep, I get the following upon waking up:

enter image description here

It is irritating because I get the bouncy iCal icon in my doc and have to dismiss the error message every time. Anyone know how to prevent this?

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Several things could cause this, but you could eliminate or reduce the chance by doing any or all of the following:

  1. Turn off all networking before sleeping.
  2. Reduce the refresh time period for that calendar to avoid it refreshing while the system is waking or getting re-connected with an available network.
  3. Quit Calendar before sleeping.
  4. Move the calendar to another hosting site (assuming it's not really the Mac that's causing the http error.)
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