its most likely a bad php add handler “AddHandler” in an .htaccess file which is causing this issue which is probably being added by the plugin or leftover from a different cPanel server.
Can find this as root for a user like
user=‘Username_not_provided_in_form’; USER_HOME=$(eval echo ~${user}); sudo grep -Evir --include=\.ini --include=\.htaccess --include=\.cfg ‘^#|^;’ $USER_HOME | grep --color -E ‘AddHandler|SetHandler|ea-php|alt-php|memory_limit|post_max_size|upload_max_filesize|max_execution_time|session.save_path|php_value|php_flag’
or across a server like
sudo grep -Evir --include=\.ini --include=\.htaccess --include=\.cfg ‘^#|^;’ /home| grep -Ev ‘11211|memory_limit 1024M|memory_limit = 1024M|upload_max_filesize 150M|upload_max_filesize = 150M|max_execution_time = 300|post_max_size 256M|post_max_size = 256M|php_value max_execution_time 300|virtfs|language|include_path|extension_dir’| grep --color -E ‘AddHandler|SetHandler|ea-php|memory_limit|post_max_size|upload_max_filesize|max_execution_time|session.save_path|php_value|php_flag’
Can find all these commands and more in the WizardAssistant app which has all of the cyberpanel CLI and tons of other handy goodies for troubleshooting stuff like this
videos here
Hopefully that was helpful