I am using virtualmin to manage my server. My document root /home. Everything is okay when I add new domain. When I checked in domain.com I got "Index Of". I think it was normal.
But, after I uploaded some file, I got "500 Internal Server Error". I see on virtualmin logs, I got

AH01215: suexec policy violation: see suexec log for more detail

.

 [pid 7436] [client 202.xxx.xxx.xxx:xxxx] End of script output before headers: php-cgi

Where do I can find suexec logs and how do I fix this problem ?
Need for help.