nav-menus.php

Everything was working fine whith my menu but today when I tried to manage it on the dashbord this error showed up
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Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator to inform of the time the error occurred and of anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Web Server at conadeip.org.mx
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I don’t know what happened because I haven’t do anything!

Can someone help me? please?