Install / Active Tutor LMS

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Fatal error: Uncaught Error: Undefined constant "WP_PLUGIN_DIR" in /home3/mercatri/public_html/wp-content/plugins/tutor-pro/views/install-tutor.php:7 Stack trace: #0 {main} thrown in /home3/mercatri/public_html/wp-content/plugins/tutor-pro/views/install-tutor.php on line 7