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Warning: include_once(): Failed opening 'Mage/Core/functions.php' for inclusion (include_path='/var/www/vhosts/hundeleben-potsdam.de/httpdocs/app/code/local:/var/www/vhosts/hundeleben-potsdam.de/httpdocs/app/code/community:/var/www/vhosts/hundeleben-potsdam.de/httpdocs/app/code/core:/var/www/vhosts/hundeleben-potsdam.de/httpdocs/lib:.:/opt/plesk/php/5.3/share/pear') in /var/www/vhosts/hundeleben-potsdam.de/httpdocs/app/Mage.php on line 50

Fatal error: Call to undefined function is_dir_writeable() in /var/www/vhosts/hundeleben-potsdam.de/httpdocs/app/code/core/Mage/Core/Model/Config/Options.php on line 220