Hello, I try to install php 7.4 on my site and the administrator as well as old pages do not recognize it. They tell me that it could be a plugin or theme that does not support the indicated version. You could support me in this problem. I send you the message that the server sends me.
In addition to this, I indicate that when I try to update joomla to version 4, it indicates several plugins that require updating.
i.is.cc/2BtsV8iC.png
Message server
php7.4 installed correctly on server, but it seems like installed plugins/theme on elregionalpiura.com.pe isn't supported on php the latest version php7.4.
Webserver logs have:
2021-11-29 18:31:17.027361 [NOTICE] [384627] [172.70.135.124:52548#elregionalpiura.com.pe-80] [STDERR] PHP Notice: Undefined property: stdClass::$readmore in /home/elreg896/domains/elregionalpiura.com.pe/public_html/templates/ja_teline_v/html/layouts/joomla/content/item/default.php on line 121
2021-11-29 18:31:18.200501 [NOTICE] [384627] [141.101.69.238:33014#elregionalpiura.com.pe-80] [STDERR] PHP Notice: Undefined property: stdClass::$readmore in /home/elreg896/domains/elregionalpiura.com.pe/public_html/templates/ja_teline_v/html/layouts/joomla/content/item/default.php on line 121
