Unable to reconfigure domain or restart or reload Apache:
# /usr/local/psa/admin/sbin/httpdmng --reconfigure-all
ERR (3): Apache config (13764726400.48499300) generation failed: Syntax error on line 42 of /var/www/vhosts/example.com/conf/13764726400.48499300_httpd.include:
SSLCACertificateFile: file '/usr/local/psa/var/certificates/cert-20mSLq' does not exist or is empty
The following errors are found in
ERR [util_exec] proc_close() failed ['/usr/local/psa/admin/bin/apache-config' '-t'] with exit code 
ERR  '/usr/local/psa/admin/bin/apache-config' '-t' failed with code 1.
Syntax error on line 50 of /etc/httpd/conf/plesk.conf.d/vhosts/example.com.conf:
SSLCertificateFile: file '/usr/local/psa/var/certificates/cert-20mSLq' does not exist or is empty
/usr/local/psa/var/certificates/cert-20mSLqis missing on a server.
The certificate in
/usr/local/psa/var/certificates/ directory was removed, the file is empty, it has wrong permissions (not '0644'), or it doesn't exist while new configuration was not applied to Apache configuration files.
Generate configuration files using "Webserver configurations troubleshooter" extension or
Reconfigure SSL certificates:
# plesk bin repair --reconfigure-ssl-certificates
For permission repair, please execute this command:
# chmod 644 /usr/local/psa/var/certificates/cert-*