This article covers the different ways to tackle the Internal Error which happens when the svmstack-fpm service is running instead of svmstack-fpm7 on the Master node.
To fix this error:
1. Connect to SolusVM Master node via SSH.
2. Stop svmstack-fpm service and start svmstack-fpm7 service:
$ systemctl stop svmstack-fpm && systemctl start svmstack-fpm7