Subdomain blank

[Dr_The_One]

Suddenly, my subdmain url show blank page but even I manage its admin CP pefectly.
Can any one help me in this issue?
Thank you.

I can not able to open http://www.xxx.com/Testing but I can manage http://www.xxx.com/Testing/admin/index.php

[.m.]

try tracing the cause from recent entries of server error log (available at web host control panel)