Fatal Error When Installing

  • Receiving a Fatal Error after installing plugin. Every admin page in WordPress now shows an error:

    Fatal error: Uncaught Error: Call to undefined function is_plugin_active() in /Users/***/Local Sites/***/app/public/wp-content/plugins/stonehenge-em-gateway-selector/stonehenge-em-gateway-selector.php on line 54

    WordPress 5.9
    PHP 7.4.1
    MySQL 5.7.28a

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