I’m having the same issue on two different sites.
Fatal error: Uncaught ArgumentCountError: 3 arguments are required
Fatal error: Uncaught ArgumentCountError: 3 arguments are required,……
wp-content/plugins/contact-form-7/admin/includes/welcome-panel.php on line 148
wp-content/plugins/contact-form-7/admin/includes/welcome-panel.php on line 153
Where can we see the website in question?
I managed to solve the problem by rolled back to 5.8.
Unfortuanately 5.9 has the same issue. I didn’t bother to try the 3rd digit versions. 5.8.x may work or not.
My suggestion is that wpcf7_link has been updated to use 3 arguments but the usage of this functions are not.
I was having the same issue, no contact form could be displayed and I was getting the error:
Error Details
An error of type E_ERROR was caused in line 148 of the file /wp-content/plugins/contact-form-7/admin/includes/welcome-panel.php.
Error message: Uncaught ArgumentCountError: 3 arguments are required, 2 given in /wp-content/plugins/contact-form-7/admin/includes/welcome-panel.php:148
From the error message you provided, it appears that the error is caused by an insufficient number of arguments in the sprintf() function call. The sprintf() function requires at least two arguments: one is the format string, and the other is the parameter to be formatted. The error message indicates that a third argument is required, but it has not been provided.
This issue occurs in the welcome-panel.php file of the Contact Form 7 plugin.
Apparently yes. Temporary solution is downgrade the plugin to version 5.8.
I removed the sprintf() function on line 148 of welcome-panel.php
the problem was solved.
Thanks @phonograph using your method, I also temporarily solved this problem.
The error caused by protected function content() is still not fixed in the new version
