On Ubunbu14.04 configuration file extension is changed from Ub12.
Ubuntu 12.04
# Include generic snippets of statements Include conf.d/ # Include the virtual host configurations: Include sites-enabled/
Ubuntu 14.04
# Include generic snippets of statements IncludeOptional conf-enabled/*.conf # Include the virtual host configurations: IncludeOptional sites-enabled/*.conf
so, you just add ‘.conf’ extension on your virtualhost configuration file.
then problem solved.