Fatal error: Call to undefined function wpcf7_link()

I’m getting this error at the very bottom of the Edit Contact Form page:

Fatal error: Call to undefined function wpcf7_link() in /home/bleesp5/public_html/wp-content/plugins/contact-form-7-city-field-extension/contact-form-7-city-field-extension.php on line 169

This was working relatively recently, as far as I know. Any ideas?

Thanks

https://www.ads-software.com/plugins/contact-form-7-city-field-extension/