Yep, another one of these threads. Unfortunately, everyone else's problems seem to occur after they get the integration to work in the first place. I am using MediaWiki 1.19 (Fresh install) and SMF 2.0.2. I'm just trying to get the integration to work before I start messing with user groups, so the only thing I have changed from the githubs localsetting.php file is the directory location ($wgSMFPath = "../forum"; changed to $wgSMFPath = "../main"

. That line at least I know is set correctly because otherwise I get a "Check to make sure $wgSMFPath is correctly set in LocalSettings.php!" message. Now having set the localsettings.php to just activate the "/Auth_SMF.php" file, I get the following error messages:
Warning: Cannot modify header information - headers already sent by (output started at /home/content/i/l/k/ilkhaniv/html/roster/extensions/Auth_SMF.php:1) in /home/content/i/l/k/ilkhaniv/html/roster/includes/WebResponse.php on line 38
Warning: Cannot modify header information - headers already sent by (output started at /home/content/i/l/k/ilkhaniv/html/roster/extensions/Auth_SMF.php:1) in /home/content/i/l/k/ilkhaniv/html/roster/includes/WebResponse.php on line 38
Warning: Cannot modify header information - headers already sent by (output started at /home/content/i/l/k/ilkhaniv/html/roster/extensions/Auth_SMF.php:1) in /home/content/i/l/k/ilkhaniv/html/roster/includes/WebResponse.php on line 38
Warning: Cannot modify header information - headers already sent by (output started at /home/content/i/l/k/ilkhaniv/html/roster/extensions/Auth_SMF.php:1) in /home/content/i/l/k/ilkhaniv/html/roster/includes/WebResponse.php on line 38
Warning: Cannot modify header information - headers already sent by (output started at /home/content/i/l/k/ilkhaniv/html/roster/extensions/Auth_SMF.php:1) in /home/content/i/l/k/ilkhaniv/html/roster/includes/WebResponse.php on line 38
Warning: Cannot modify header information - headers already sent by (output started at /home/content/i/l/k/ilkhaniv/html/roster/extensions/Auth_SMF.php:1) in /home/content/i/l/k/ilkhaniv/html/roster/includes/WebResponse.php on line 38
Warning: Cannot modify header information - headers already sent by (output started at /home/content/i/l/k/ilkhaniv/html/roster/extensions/Auth_SMF.php:1) in /home/content/i/l/k/ilkhaniv/html/roster/includes/WebResponse.php on line 38
Going over the other threads, I can say that the Auth_SMF.php is in the /extensions folder, both are installed in the same database, and MediaWiki did work before I installed this extension. Also, when I googled what the header error might have meant, it said there might be a white space problem on line 1, so I put both "<?php" and "/*" on the same lines, but got an error at every other line after that. Any help?