undefined index

hello,

After configuring module, I tried to enter keywords...
this is the error message I get

Notice : Undefined index: entity dans metatags_quick_admin_path_based_edit_validate() (ligne 570 dans /homepages/42/d141549472/htdocs/adret/drupal/sites/all/modules/metatags_quick/metatags_quick.admin.inc).
Notice : Undefined index: entity dans metatags_quick_admin_path_based_edit_submit() (ligne 582 dans /homepages/42/d141549472/htdocs/adret/drupal/sites/all/modules/metatags_quick/metatags_quick.admin.inc).
Wrong path

please help!