After updating a certificate in Plesk I got the error message:

New configuration files for the Apache web server were not created due to the errors in configuration templates:
Syntax error on line 50 of /etc/apache2/plesk.conf.d/vhosts/xxx.conf: SSLCertificateFile: file ‚/opt/psa/var/certificates/cert-xxx‘ does not exist or is empty .

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To fix this:

1. Log into your server using ssh
2. cd /opt/psa/var/certificates/
3. Determine the new name of the certificate (first output of ls -lt) e.g. cert-yyyyy
4. Create the missing certificate: cp cert-yyyyy cert-xxxxx
5. Click on the link in the error message to regenerate all configuration files.

The error message should disappear.