More likely a configuration error somewhere. If you're able to get to the tools & settings section you can have it do a diag on the configuration, otherwise I'd probably go and connect to your server via SSH and run the follow command:
This will do a check for all the configurations and ask if you want to do any repair if there's anything.
summary
docs.plesk.com
Using the Plesk repair utility with the all aspect performs all the checks included in all other aspects. Use the ple...
docs.plesk.com
Resources if you want to learn more about the plesk repair utility.