WordPress plugins (contact-form-7, recaptcha.php)

[@ reference removed]

Please note that the link I have given is actually currently down as will be explained below!

So I was applying the new Galleria Metropolia theme in WordPress for a website that I am helping to manage, and then it recommended me to install and activate several plugins. One of them was the following, alongside various others such as: cmsmasters-mega-menu, cmsmasters-content-composer, etc.

But then after activating these plugins, I could no longer access either the wp-admin page or the page itself. And the error messages displayed were as follows:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 5120 bytes) in /home/oxfordlawsoc/public_html/wp-content/plugins/contact-form-7/modules/recaptcha.php on line 485

(NB: Various line numbers were displayed over the past hour, including 490, 476 and 346)

Hence I would appreciate if [@ reference removed] could kindly let me know what is going on here; I was hoping that the author of the PHP code would probably know what was going on here and be able to help with troubleshooting.
Plugin Name: Contact Form 7
Plugin URI: https://contactform7.com/

• This topic was modified 5 years, 11 months ago by yklaw249.
• This topic was modified 5 years, 11 months ago by Steven Stern (sterndata).
• This topic was modified 5 years, 11 months ago by Steven Stern (sterndata).

The page I need help with: [log in to see the link]