I thought this might be a common problem and someone in this forum might know the fix.
Thanks in advance for taking a look:
Warning: Cannot modify header information - headers already sent by (output started at /home/marketi3/public_html/data/member/const.inc:19) in /home/marketi3/public_html/admin/login.inc on line 19
Template Error: loadfile: page is not a valid handle.
Halted.
Warning: Unknown: Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively. in Unknown on line 0