After WordPress updating getting error

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After updating my client’s WordPress site to 4.7 version, I could not access the website and wp-admin. I got this error

Fatal error: Class ‘WP_Roles’ not found in /webcorp1/www/corpusers/h/y/domain.com/wp-settings.php on line 293

Help me guys..I need it urgently for my client..Thanks in advance

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