Internal Server error after changing root directory

Hi, I have an AWS EC2 Ubuntu server on that I have installed Virtualmin, after migration many sites I saw my primary partition is only 8 GB and going to full so I have decided to move my site to another partition.

So I have created a folder name home under /mnt after that I used Server Configuration > Change Domain Name and then put /mnt/home/site_name to Change home directory?, my all folders and files copied to new directory but site not working, its giving internal server error.

When I checked error log I see
(104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server

I tried with changing to mod_php, CGI from Website Option, but nothing is working.

Please help me…