Admin can't access to modify

Hi

After nodeaccess installation the admin can't modify an article or any content that use wysiwyg tinymce (I haven't tested all the possibilities)

I got
PDOException : SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '16-1-nodeaccess_author' for key 'PRIMARY': INSERT INTO {node_access} (nid, realm, gid, grant_view, grant_update, grant_delete) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5), (:db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9, :db_insert_placeholder_10, :db_insert_placeholder_11); Array ( [:db_insert_placeholder_0] => 16 [:db_insert_placeholder_1] => nodeaccess_author [:db_insert_placeholder_2] => 1 [:db_insert_placeholder_3] => 1 [:db_insert_placeholder_4] => 1 [:db_insert_placeholder_5] => 1 [:db_insert_placeholder_6] => 16 [:db_insert_placeholder_7] => nodeaccess_author [:db_insert_placeholder_8] => 1 [:db_insert_placeholder_9] => 1 [:db_insert_placeholder_10] => 1 [:db_insert_placeholder_11] => 1 ) dans node_access_write_grants() (ligne 3564 dans D:\wamp\www\drupal16\modules\node\node.module).

I think my grants well configured.

What can I do ? That's urgent !

Sincerely
Jean-Jacques