There are incorrect function names in the menu_breadcrumb.module on lines 323 and 332. The correct function name is menu_set_active_menu_names instead of menu_set_active_menu_name. The function name changed in D7 http://api.drupal.org/api/drupal/includes--menu.inc/function/menu_set_ac... .

I have attached a patch file. I wasn't sure if this should be appended to the discussion on issue #670840: Port Menu breadcrumb module to Drupal 7 comment #18 or if this warranted a separate issue. Apologies in advance.

Files: 
CommentFileSizeAuthor
menu_breadcrumb_set_active_menu_names.patch586 bytescchan

Comments

My apologies, the error only appears on line 323.