Website is not responding and editor disappeared

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Thank you! Now when I open page I see:

Code:

Warning: file_get_contents(/var/www/vhosts/kr.uz/subdomains/resprof/httpdocs/data/pages/otdel-socialnoj-zashhity.xml): failed to open stream: Too many open files in /var/www/vhosts/kr.uz/subdomains/resprof/httpdocs/admin/inc/caching_functions.php on line 240 Notice: Trying to get property of non-object in /var/www/vhosts/kr.uz/subdomains/resprof/httpdocs/admin/inc/caching_functions.php on line 243 Fatal error: Call to a member function children() on a non-object in /var/www/vhosts/kr.uz/subdomains/resprof/httpdocs/admin/inc/caching_functions.php on line 249

the errorlog contains a lot of strings:

Code:

[26-Jul-2013 22:25:09] PHP Warning:  SimpleXMLElement::asXML(/var/www/vhosts/kr.uz/subdomains/resprof/httpdocs/data/other/pages.xml): failed to open stream: Permission denied in /var/www/vhosts/kr.uz/subdomains/resprof/httpdocs/admin/inc/caching_functions.php on line 272