Setting up local dev, "call to undefined function" from a module that I uninstalled a few months ago
Most of the time this a cache problem.


First try to clear the cache via Drupal (Clear cache button). Or use Drush (drush cc all).
You can clear the cache tables by truncating them. Check all the tables with cache_ prefix.
If #1 and #2 didn't fix the problem then check if you have Memcache or similar installed. Flush the cache as well.
Another thing could be APC or similar opcode cache.