Problem upgrading my forum

[sciencefriction]

I am using the webinstall.php and am trying to upgrade from 1.1.3 to 2.x and when I try and run the update it downloads then unpacks properly but before it installs I get this message

Warning: Cannot modify header information - headers already sent by (output started at /home/dxdforum/public_html/webinstall.php:2) in /home/dxdforum/public_html/webinstall.php on line 916


Now my forums are no longer working, I get this when I try and go to them

Unknown column 'a.attachment_type' in 'field list'

sigh, I accidentally the whole thing I think

[sciencefriction]

Also this happened when I tried updating to the newest version of 1.x, so it's not just a 2.x thing

[sciencefriction]

http://www.simplemachines.org/community/index.php?topic=423046.msg2961396#msg2961396

trying that, sorry it didn't show up in my initial searches

[sciencefriction]

Seems to have worked, I'm sure I'll be back with something else though haha