Warning: session_start() [function.session-start]: open(/var/php_sessions/) failed: No such file or directory (2) in /www/phpGrid/server/classes/cls_db.php(1) : eval()'d code on line 1
phpGrid requies session to work.
First of all, if you have access to php.ini, check if path in session.save_path is valid and writable. In Linux, by default, the path is /var/php_sessions/
In addition, please make sure session.auto_start must be set to 1 in php.ini.
Some web hosting services such as iPage, disallows shared user session folder for security reasons. Users MUST create and maintain their own session folder.
http://www.ipage.com/knowledgebase/beta/article.bml?ArticleID=1290&type=How%20To#Nugget_1374