I cannot get onto my Users & Groups

When I get onto System Preferences, it shows that Users & Groups is grayed out, or won't let me in it.
Something will pop up, such as "Users & Groups is unavailible to you right now"...
It was working fine earlier.
Help?
Thank you.

"You can't open the "Users & Groups" preferences pane because it is not available to you at this time.
This is what it says. ^^^^^^

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I cannot get onto my Users & Groups

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