File upload error...

$un=mysql_escape_string($this->input->post('uni_name'));
$tm=mysql_escape_string($this->input->post('team_name'));

            //end
            //file upload
$pa="";
            if($_FILES["team_photo"]["type"]!='application/zip' ||
$_FILES["team_photo"]["type"]!='application/rar') {
                $error="File format error. Please choose zip/rar file";
            }
            else if($_FILES["team_photo"]["size"]>10500) {
                $error="File is too large.";
            }
            else {
                $pa="images/ProgrammingContest";

                //here a new folder will create as the name of $un

                move_uploaded_file($_FILES["team_photo"]["tmp_name"],$pa.'/'.$un.'/'.$tm.'.zip');