在此服务器Ubuntu .htaccess上找不到请求的URL

I have a directory named gplus within /var/www path. And my configuration file , ie guwahatiplus.com.conf is as below

<VirtualHost *:80>

        ServerAdmin nitish@guwahatiplus.com
        ServerName guwahatiplus.com
        ServerAlias www.guwahatiplus.com
        DocumentRoot /var/www/gplus/

        <Directory />

        Options FollowSymLinks
         AllowOverride None
        </Directory>
        <Directory /var/www/gplus>
         Options Indexes FollowSymLinks MultiViews
         AllowOverride All
         Order allow,deny
         allow from all
        </Directory>

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined
        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
        # error, crit, alert, emerg.
        # It is also possible to configure the loglevel for particular
        # modules, e.g.
        #LogLevel info ssl:warn

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined

        # For most configuration files from conf-available/, which are
        # enabled or disabled at a global level, it is possible to
        # include a line for only one particular virtual host. For example the
        # following line enables the CGI configuration for this host only
        # after it has been globally disabled with "a2disconf".
        #Include conf-available/serve-cgi-bin.conf
</VirtualHost>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

My mod_rewrite is On. And the .htaccess file is

RewriteEngine On
Options +MultiViews
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/$ $1.php
RewriteRule ^([^/]+)/([^/]+)/$ /$1/$2.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !(\.[a-zA-Z0-9]{1,5}|/)$
RewriteRule (.*)$ /$1/ [R=301,L]

Now if I go to url http://www.guwahatiplus.com/gplustest.php, its displaying , but http://www.guwahatiplus.com/gplustest not. Whats wrong.

NB : I have hosted the files at Digitalocean