Log in to the Plesk database:
mysql -uadmin -p`cat /etc/psa/.psa.shadow` -Dpsa
Apply the following SQL query:
mysql> INSERT INTO misc VALUES ('restart_apache_gracefully', 'true');
When there is an issue interacting with the Plesk API, the module log under Tools > Logs > Module Log sometimes includes errors.
1018 - Unable to create hosting. IP address does not exist in client's pool.
This error usually indicates that the IP address is set as "dedicated" instead of shared. To check and update this in Plesk visit Tools and Settings > IP Addresses. Then, click on the IP address and change the type to "shared".