Fatal Error: Redux Framework | WordPress.org

I am getting a fatal error, can’t login to the wp-admin site. Not sure how to resolve it; any help would be greatly appreciated;

Fatal error: Call to undefined function class_alias() in /home4/gospelme/public_html/springdalemd.org/wp-content/plugins/redux-framework/class-redux-framework-plugin.php on line 457

The page I need help with: [log in to see the link]

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