I'm trying to debug a PHP error caused by a typo in a module somewhere.  The exact errors are:

Unexpected character in input:  ''' (ASCII=39) state=1 in /var/www/dev.meld.org/drupal-6.x/sites/all/modules/ctools/plugins/access/php.inc(55) : eval()'d code on line 1, referer: http://dev.meld.org/admin/build/modules/list
Unexpected character in input:  ''' (ASCII=39) state=1 in /var/www/dev.meld.org/drupal-6.x/sites/all/modules/ctools/plugins/access/php.inc(55) : eval()'d code on line 1, referer: http://dev.meld.org/
Unexpected character in input:  ''' (ASCII=39) state=1 in /var/www/dev.meld.org/drupal-6.x/sites/all/modules/ctools/plugins/access/php.inc(55) : eval()'d code on line 1, referer: http://dev.meld.org/member/register
Unexpected character in input:  ''' (ASCII=39) state=1 in /var/www/dev.meld.org/drupal-6.x/sites/all/modules/ctools/plugins/access/php.inc(55) : eval()'d code on line 1, referer: http://dev.meld.org/member/register

To debug this, it's been suggested to me to go to line 55 in sites/all/modules/ctools/plugins/access/php.inc and add throw new Exception to find the offending module.  You'll want to condition the throw new Exception to only when arg(0) == 'member' && arg(1) == 'register'.

Line 55 is this function:

function ctools_php_ctools_access_check($__conf, $contexts) {
  $access = eval($__conf['php']);
  return $access;
}

As an admitted PHP neophyte, I have no idea how to add the Exception.  As fixing this bug as fast as possible is my priority right now, can anyone tell me how to add the Exception?