If it's your server and you can actually mess around with configuration, you can turn off the open_basedir
in your php.ini, reload PHP and try if it works. safe_mode
should be turned off in PHP by default as this option causes only problems.
Or you can try following:
<Directory /var/www/vhosts/domain.com/httpdocs>
php_admin_value open_basedir "/var/www/vhosts/domain.com/httpdocs/:/tmp/:/var/www/vhosts/domain.com/uploads/"
</Directory>
Same can apply for the php.ini if you decide to set the config there.