Found this error in my apache error logs:

PHP Fatal error: Call to undefined function feeds_importer_load_all() in /DRUPAL7/sites/all/modules/contrib/feeds_tamper/feeds_tamper.module on line 107, referer: http://EXAMPLE.COM/eng/admin/people/permissions


Status:Active» Closed (won't fix)

This is an error from feeds_tamper module right?

Project:Feeds» Feeds Tamper
Version:7.x-2.0-alpha7» 7.x-1.0-beta4
Status:Closed (won't fix)» Active

Well, not your issue anyways. I should have picked that out. Thanks @dgtlmoon

Status:Active» Postponed (maintainer needs more info)

This definitely don't normally happen. Could you be missing the Feeds module or something?

I have this error as well. This error would occur repeatedly when my i would flush the drupal cache with drush. It would provide the following error:

PHP Fatal error:  Call to undefined function feeds_importer_load_all() in /home/ubuntu/site/stage/sites/all/modules/feeds_tamper/feeds_tamper.module on line 107

I think i may have fixed it. I had to rebuild the my database registry with the registry rebuild module.

performing a drush rr provides the following output:

Manually deleted 1 stale file from the registry.                       [success]
A file has been declared in a module's .info, but could not be found.  [warning]
This is probably indicative of a bug. The missing file is
The registry has been rebuilt.                                         [success]
'drush' cache was cleared