Plugin breaks CF7 Config Validation after major WPCF7_ConfigValidator rewrite

I believe I’m here for the same reason. Saving the contact form throws this fatal PHP error:

(Contact Form 7 version 5.8.1 and Conditional Fields for CF7 version 2.3.11)

[16-Oct-2023 19:40:44 UTC] PHP Fatal error:  Uncaught Error: Undefined constant WPCF7_ConfigValidator::error_invalid_mailbox_syntax in /home/[domain]/wp-content/plugins/cf7-conditional-fields/cf7cf.php:78
Stack trace:
#0 /home/[domain]/wp-includes/class-wp-hook.php(310): CF7CF->wpcf7cf_config_validator_validate(Object(WPCF7_ConfigValidator))
#1 /home/[domain]/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters('', Array)
#2 /home/[domain]/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#3 /home/[domain]/wp-content/plugins/contact-form-7/includes/config-validator/validator.php(329): do_action('wpcf7_config_va...', Object(WPCF7_ConfigValidator))
#4 /home/[domain]/wp-content/plugins/contact-form-7/admin/admin.php(249): WPCF7_ConfigValidator->validate()
#5 /home/[domain]/wp-includes/class-wp-hook.php(308): wpcf7_load_contact_form_admin()
#6 /home/[domain]/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters('', Array)
#7 /home/[domain]/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#8 /home/[domain]/wp-admin/admin.php(237): do_action('load-toplevel_p...')
#9 {main}
  thrown in /home/[domain]/wp-content/plugins/cf7-conditional-fields/cf7cf.php on line 78

I have the same issue.

Reported to developer at Github too:

https://github.com/pwkip/contact-form-7-conditional-fields/issues/112

@jules-colle I’ve created a PR on Github to fix the issue.

Good afternoon,
So until they fix the bug in Github the plugin will not work correctly with “disable_on_hide”?

Sorry I’ve been neglecting this support forum for a while. Will investigate this issue as soon as I can. Thanks for the help and PR @joostdekeijzer

The PR has been merged in version 2.4. Thanks again Joost!