If you want to see apache error.log file in your public_html or subdomain dir :
1) Login to Cwp with root account.
2) Go to Apache Settings/ Apache Vhosts Template
3) In Apache Domain Virtual Host tpl:
Add this line after (DocumentRoot "%homedir%/%username%/public_html"):
ErrorLog "%homedir%/%username%/public_html/error.log"4) In Apache SubDomain Virtual Host tpl:
Add this line after (DocumentRoot "%path%") :
ErrorLog "%path%/error.log"5) Click Save Changes and Go to : Rebuild Virtual Hosts and Click "Rebuild All Virtual Hosts"
6) Alright!! You can see error.log file in public_html or your subdomain_dir :