Fatal error: Uncaught Error: Interface 'NinjaForms\Includes\Contracts\SubmissionHandler' not found in /home/clmepl5/public_html/web/app/plugins/ninja-forms/includes/Abstracts/SubmissionHandler.php:26 Stack trace: #0 {main} thrown in /home/clmepl5/public_html/web/app/plugins/ninja-forms/includes/Abstracts/SubmissionHandler.php on line 26