Activate plugin Error (No such file or directory)

  • Hi!

    I installed your plugin and turned it on but it does not work.
    I click on setting label but I have an error message of this type:

    Notice: Use of undefined constant PMPRO_DIR – assumed ‘PMPRO_DIR’ in /var/www/html/wp-content/plugins/pmpro-email-templates-addon/adminpages/emailtemplates.php on line 10

    Warning: require_once(PMPRO_DIR/adminpages/admin_header.php): failed to open stream: No such file or directory in /var/www/html/wp-content/plugins/pmpro-email-templates-addon/adminpages/emailtemplates.php on line 10

    Fatal error: require_once(): Failed opening required ‘PMPRO_DIR/adminpages/admin_header.php’ (include_path=’.:/usr/share/php’) in /var/www/html/wp-content/plugins/pmpro-email-templates-addon/adminpages/emailtemplates.php on line 10

    How can I fix this error?

    Best regards.

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