cron: "Fatal error: Call to undefined function filefield_get_field_list() in modules/imagefield/imagefield.module on line 137"

Same with -dev version.

cron hadn't successfully completed for more than a week.

This is on a multi-site installation.
imagefield was only in the specific site's modules directory, problem resolved when moved to all/modules/

This might help others: Move both filefield and imagefiled to sites/all/modules.

Appearing on another site, not sufficient to make sure *field is in sites/all/modules (and nothing in sites/example.com/modules).

Fatal error: Call to undefined function filefield_get_field_list() in sites/all/modules/imagefield/imagefield.module on line 128

I upgraded, problem still there.
Problem was fixed after disabling and re-enabling FileField.

I think I was too fast, this problem is still occurring. system table looks but somehow drush sm doesn't show a version number for filefield.

mysql> select * from system where name = 'filefield'\G
*************************** 1. row ***************************
      filename: sites/all/modules/filefield/filefield.module
          name: filefield
          type: module
         owner: 
        status: 1
      throttle: 0
     bootstrap: 0
schema_version: 6104
        weight: 0
          info: a:8:{s:4:"name";s:9:"FileField";s:11:"description";s:26:"Defines a file field type.";s:12:"dependencies";a:1:{i:0;s:7:"content";}s:7:"package";s:3:"CCK";s:4:"core";s:3:"6.x";s:3:"php";s:3:"5.2";s:10:"dependents";a:0:{}s:7:"version";N;}
1 row in set (0.00 sec)

$ drush sm|grep filefield
 CCK                               FileField (filefield)                                             Module  Enabled                       
 CCK                               FileField Meta (filefield_meta)                                   Module  Not installed                 
 CCK                               FileField Tokens (filefield_token)                                Module  Not installed                 

With some more fiddling around... The problem was that content_access was not defined, which is freaking weird as well.
I added return false to filefield_view_access(); ran cron once, then removed return false and now cron seems to be running fine again...

function filefield_view_access($field_name) {
  return FALSE;
  if (!content_access('view', content_fields($field_name))) {
    return FALSE;
  }
  // No content permissions to check, so let's fall back to a more general permission.
  return user_access('access content') || user_access('administer nodes');
}