Script Error

exception 'Zend_Session_Exception' with message 'Unable to set session handler' in C:\inetpub\wwwroot\amember\library\Zend\Session.php:283
Stack trace:
#0 C:\inetpub\wwwroot\amember\library\Am\App.php(2219): Zend_Session::setSaveHandler(Object(Am_Session_SaveHandler))
#1 C:\inetpub\wwwroot\amember\library\Am\App.php(1574): Am_App->initSession()
#2 C:\inetpub\wwwroot\amember\bootstrap.php(25): Am_App->bootstrap()
#3 C:\inetpub\wwwroot\amember\index.php(91): require_once('C:\inetpub\wwwr...')
#4 {main}:Unable to set session handler