Trying to setup subdomain on Apache2 but getting subdomain is unavailable

Trying to setup subdomain on Apache2 but getting subdomain is unavailable

I am trying to setup a subdomain in Apache2, I have two folders in www
folder, ankurkaushal & owncloud. I want to make subdomain for owncloud.
I have a dedicated IP address for my server and I have setup A records on
registrar's end too.
Whenever I try access owncloud.ankurkaushal.me, I get that
owncloud.ankurkaushal.me is unavailable.
Here's my sites-available/default file:
<VirtualHost *:80>
ServerAdmin ankurkaushal@outlook.com
ServerAlias ankurkaushal.me
DocumentRoot /var/www/ankurkaushal/
<Directory />
Options FollowSymLinks
AllowOverride None
</Directory>
<Directory /var/www/ankurkaushal/>
Options Indexes FollowSymLinks MultiViews
AllowOverride None
Order allow,deny
allow from all
</Directory>
ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
<Directory "/usr/lib/cgi-bin">
AllowOverride None
Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
Order allow,deny
Allow from all
</Directory>
ErrorLog ${APACHE_LOG_DIR}/error.log
# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
LogLevel warn
CustomLog ${APACHE_LOG_DIR}/access.log combined
Alias /doc/ "/usr/share/doc/"
<Directory "/usr/share/doc/">
Options Indexes MultiViews FollowSymLinks
AllowOverride None
Order deny,allow
Deny from all
Allow from 127.0.0.0/255.0.0.0 ::1/128
</Directory>
</VirtualHost>
#Owncloud
<VirtualHost *:80>
ServerAdmin ankurkaushal@outlook.com
ServerName owncloud.ankurkaushal.me
ServerAlias owncloud.ankurkaushal.me
DocumentRoot /var/www/owncloud/
<Directory />
Options FollowSymLinks
AllowOverride None
</Directory>
<Directory /var/www/owncloud/>
Options Indexes FollowSymLinks MultiViews
AllowOverride None
Order allow,deny
allow from all
</Directory>
ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
<Directory "/usr/lib/cgi-bin">
AllowOverride None
Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
Order allow,deny
Allow from all
</Directory>
ErrorLog ${APACHE_LOG_DIR}/error.log
# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
LogLevel warn
CustomLog ${APACHE_LOG_DIR}/access.log combined
Alias /doc/ "/usr/share/doc/"
<Directory "/usr/share/doc/">
Options Indexes MultiViews FollowSymLinks
AllowOverride None
Order deny,allow
Deny from all
Allow from 127.0.0.0/255.0.0.0 ::1/128
</Directory>
</VirtualHost>
Here is the most recent error.log
[Sun Aug 25 02:25:30 2013] [notice] Apache/2.2.22 (Ubuntu)
PHP/5.3.10-1ubuntu3.7 with Suhosin-Patch configured -- resuming normal
operations
[Sun Aug 25 02:26:57 2013] [error] [client 24.212.255.66] File does not
exist: /var/www/ankurkaushal/owncloud, referer:
http://144.76.93.122/owncloud/
Can someone help me in resolving the issue?