Re: Image Upload 1.2.1
What version of PunBB are you using? All the lines matched up when I was doing the edits, so I can only assume that it's something close to 1.2.7... 1.2.5? Just open up install_mod.php, and change the line that states: $punbb_versions = array('1.2.6', '1.2.7'); to include the version of the board you are using.
As far as that error goes, I don't think it relates to this mod. Have you done any other edits to your site?
Line 35 is this: require PUN_ROOT.'lang/'.$pun_user['language'].'/index.php';
What that error states is that $pun_user['language'] is not defined. Don't know why this would be, so some other edits would be my only guess.