Unable to install piwik on Raspberry Pi B+ :S

I have a raspbery pi b+ with raspbian (a debian fork for raspberry pi devices) and this is the list of stuffs I’ve installed on, from the raspbian repository:

  • apache 2.2.22-13+deb7u4
  • php5 5.4.39-0+deb7u2
  • mysql-server 5.5.43-0+deb7u1

I’ve also installed all additional packages, which mentioned in this tutorial… and I also set the permissions for /var/www/piwik correctly…
but when I want to start the installation process from browser, (after 30-40 secons) I end up with a page, which contains only a frame that contains: # free/libre analytics platform with piwik logo :S

I’ve also installed owncloud and wordpress on my raspberry pi without any problems.
and here is my apache2 config file from /etc/apache2/sites-available/default

<VirtualHost *:80>
	ServerAdmin webmaster@localhost

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

	<Directory /var/www/owncloud>
		Options Indexes FollowSymLinks MultiViews
		AllowOverride All
		Order allow,deny
		allow from all

	ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
	<Directory "/usr/lib/cgi-bin">
		AllowOverride None
		Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
		Order allow,deny
		Allow from all

	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