Why can't I open video clips?

When trying to play video clips on error message opens OSstatus -54 why?

The status error -56 is a permissions error.  Have you used your iPhoto library from a different user account? Where is your iPhoto Library located? On an external drive or in the default location in your Pictures folder?
Try to repair the permissions for your iPhoto Library using the First Aid Tools.
Select your iPhoto Library in the Finder and hold down the key combination option-command ⌥⌘  .
Keep the keys held down firmly, while double clicking  your iPhoto Library, until you are seeing the First Aid panel.  Select first "repair permissions".

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