500 Internal Server Error
- Check Owner and Group of files and folders.
- Check permissions files and folders. Set folders permission 755 and files 644.
On CentOS Web Panel, fix permissions through Users Accounts => Fix Permissions => select myDomain and check on Fix Permissions, the chown group and chmod.
find /home/user_name -type d -exec chmod 755 {} \; find /home/user_name -type f -name "*" | xargs chmod 644
This will change all files and folders permission under the username.