Error: could not open calendar.php

Some users get an error when trying to export the roster to iCal. To resolve this issue please try the following. 

  1. Go to settings
  2. Go to Safari
  3. Set Block cookies to always allow
  4. Set Fraudulent website warning to off
  5. Now tap the link again to webcal://

If above does not work try to change webcal:// link to https://

Now the calendar file should open.

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