[solved] domain.com/install = Blank page.

[SiB]

Hello,

I am newbie in PrestaShop. I try install PrestaShop on my apache2 + php5.
I put files into /...vhost_dir/domain.com/ and I try open this.

I open http://domain.com and redirect to subdir install works but I see a BLANK page http://domain.com/install/ without any error even if I do this:
http://domain.com/config/config.inc.php: @ini_set('display_errors', 'on');

I try this on non-vhost dir, main www folder and situation is the same.

What I can do more or check?

Thanks for any help!

SOLVED:

I install package:
php-simplexml-5.3.5-2.i686

Now I can see correct my domain.com/install page .

[SiB]

I check VirtualHost ErrorLog file and I can see a lot of the same error, it's:

...
[$date] [error] [client $myIP] PHP Fatal error: Call to undefined function simplexml_load_file() in /.../domain.com/install/classes/LanguagesManager.php on line 21
...

phpinfo haven't entry for this, I found it's included to libxml, in phpinfo I have this:
libXML support active
libXML Compiled Version 2.7.7
libXML Loaded Version 20707
libXML streams enabled

and

Apache Version Apache/2.2.17 (Unix)
php-common-5.3.5-2.i686

and

Loaded Modules core prefork http_core mod_so mod_alias mod_auth_basic mod_authn_file mod_authz_groupfile mod_authz_user mod_env mod_include mod_negotiation mod_setenvif mod_speling mod_version mod_authz_host mod_log_config mod_mime mod_mime_magic mod_userdir mod_dir mod_php5

Can you have any idea?
Google not help me.