Fatal error trying to edit term from a group dedicated taxonomy

Dear all,

I have a fatal Error while trying to edit a taxonomy term from a vocabulary I created for a specific group.

- I greated a group type node
- I created a new category to the group
- I created terms for the group category

- I can modify that vocabulary (http://www.mysite/node/2/og/vocab/edit/vocabulary/4?destination=node%2F2...
- I can add a new term in that category (http://www.mysite/node/2/og/vocab/terms/4/add_term)
- I can list the terms for that vocabulary (http://www.mysite/node/2/og/vocab/terms/4)
- But when I try to edit an existing term, then I got the following fatal error: (http://www.mysite/admin/content/taxonomy/edit/term/14?destination=node%2...)

Fatal error: Call to undefined function taxonomy_admin_term_edit() in /usr/websites/agsos.fr/trunk/drupal-6.6/sites/all/modules/og_user_roles/og_user_roles.module on line 2697

My OG installed modules are:
- Organic groups 6.x-1.0
- OG Block Visibility 6.x-1.1
- OG Calendar 6.x-1.0
- OG Forum 6.x-1.0-beta1
- OG Garden 6.x-1.x-dev (2008-oct.-26)
- Organic Groups Registration Codes 6.x-1.0-beta1
- Subgroups for Organic groups 6.x-0.x-dev (2008-nov.-23)
- OG User Roles 6.x-1.0
- OG Vocabulary 6.x-1.x-dev (2008-août-10)