Thanks for the reply and I’m sorry for my incomplete post.
Where is the site? https://www.uomodellestelle.it on Hosting linux aruba.it
What plugins and theme do you use?
PLUGIN
Akismet Versione 3.2
Contact Form 7 Datepicker Versione 2.5.2
Contact Form 7 Versione 4.6
Cookie Notice Versione 1.2.36.1
Count Per Day Versione 3.5.6
Duplicate Post Versione 3.0.3
Envato Market Versione 1.0.0-RC2
Hello Dolly Versione 1.6
Image Hover Effects – Visual Composer Free Version Versione 1.0
Popup Maker Versione 1.4.20
Rigenera miniature Versione 2.2.6
Slider Revolution Versione 5.3.0.2
WP Super Cache Versione 1.4.8
WPBakery Visual Composer Versione 5.0
Yoast SEO Versione 3.8
THEME: Lambda (https://themeforest.net/item/lambda-multi-purpose-responsive-bootstrap-theme/9693644)
Which version of Contact Form 7 and WordPress do you use?
Contact Form 7 Versione 4.6.
Wordpress 4.6.1
When do you see the error?
When I save a form (any item I write)
I add
define( ‘WPCF7_VALIDATE_CONFIGURATION’, false );
to my wp-config.php
