Session error messages

Can anyone tell me what these error messages mean? I get them when I do a session_open(). The strange part is that I have a couple of pages that are part of this program and I use sessions for them withour any problems, but when I get to these 2 scripts in particular I get these errors on a session open: Warning: Cannot send session cookie - headers already sent by (output started at /home/dxf/public_html/rolodap/code/ldapgroupedit.phtml:3) in /home/dxf/public_html/rolodap/code/ldapgroupedit.phtml on line 11 Warning: Cannot send session cache limiter - headers already sent by (output started at /home/dxf/public_html/rolodap/code/ldapgroupedit.phtml:3) in /home/dxf/public_html/rolodap/code/ldapgroupedit.phtml on line 11 Does anyone have any ideas what they mean? I changed my session.cache_limiter setting to private, but I really don't understand what this is doing when I do this. Any help would be very much appreciated. Thanks -- Daniell Freed Computer Services Dewitt, Ross, & Stevens He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you. Beyond Good and Evil Friedrich Wilhelm Nietzche