since months I have errors

Hi,
I have last version and since months, maybe since I did install it.

How to resolve it ? thank you


Une erreur de type E_ERROR a été causée dans la ligne 59 du fichier /htdocs/wp-content/plugins/cf7-conditional-fields/tg_pane_group.php. Message d’erreur : Uncaught Error: Class "WPCF7_TagGeneratorGenerator" not found in /htdocs/wp-content/plugins/cf7-conditional-fields/tg_pane_group.php:59
Stack trace:
#0 /htdocs/wp-content/plugins/contact-form-7/admin/includes/tag-generator.php(73): wpcf7_tag_generator_group(Object(WPCF7_ContactForm), Array)
#1 /htdocs/wp-content/plugins/contact-form-7/admin/edit-contact-form.php(299): WPCF7_TagGenerator->print_panels(Object(WPCF7_ContactForm))
#2 /htdocs/wp-content/plugins/contact-form-7/admin/admin.php(377): require_once('/htdocs/wp-cont...')
#3 /htdocs/wp-includes/class-wp-hook.php(324): wpcf7_admin_management_page('')
#4 /htdocs/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array)
#5 /htdocs/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#6 /htdocs/wp-admin/admin.php(259): do_action('toplevel_page_w...')
#7 {main}
  thrown