Problem with installing Cornerstone

I’ve got a problem with installing X. I got the message in my dahsboard:Please [click here to install and activate] the required Cornerstone plugin.

After clicking I got an error message:
Een fout van het type E_COMPILE_ERROR werd veroorzaakt op regelnummer 288 van het bestand /var/www/vhosts/tivdev.com/httpdocs/wp-content/themes/x/framework/functions/updates/class-x-tgmpa-integration.php. Foutmelding: Declaration of X_Plugin_Upgrader_Skin::feedback($string) must be compatible with WP_Upgrader_Skin::feedback($string, …$args)

Without Cornerstone I cannot startbuilding my website https://tivdev.com

Hello @intveld,

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Thanks

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