Website Crashed (Critical Error) after updating to X Theme (9.0.5) Cornerstone (6.0.5) - Cornerstone can't be activated

[89Flay]

Hello, I’m such in a hurry!! After updating X theme (9.0.5) and cornerstone (6.0.5) and Wordpress (5.8) all my client’s website crashed giving me a white page with the following message “Critical Error” (please see the pic attached) and this link https://wordpress.org/support/article/faq-troubleshooting/.

I tried to:

• disable all the plugins.
• delete and install Cornerstone again

After doing that a couple of time (every time the error persisted) I tried again but now Cornerstone is installed but can’t be activated. I click on the button “activate” but the page stays white forever at this link:

http://www.acquavivawt.it/wp-admin/admin.php?page=x-addons-home&_cs_activate_nonce=ebd1c5b400

What should I do?? It is very important that the website comes active and live again ASAP.
Thank you.
Kind Regards,
Flavio

UPDATE:
And now after installing Cornerstone I can’t activate due to this error:
Fatal error : Call to undefined method ReflectionParameter::hasType() in /home/acquaviv/domains/acquavivawt.it/public_html/wp-content/plugins/cornerstone/includes/classes/Util/IocContainer.php on line 40

But such “Util” folder does not exist.

[alexander]

Hi Flavio,

I recently replied to you on another thread, but let’s keep the conversation here since you have your own post now. I suspect the fatal error you’re seeing to be a bug in Cornerstone related to specific PHP versions. Does your server allow changing PHP versions? If so, could you try 7.1 or higher?