Empty selection widget

Hi,
I have enabled the module on my website but, although i get the switcher bloc, it contain no language to click on. On my report log i have this kind of error:
Notice: Undefined index: language in languageicons_link_add() (line 82 of /Applications/MAMP/htdocs/drupal/sites/all/modules/languageicons/languageicons.module).
Notice: Undefined index: language in lang_dropdown_form() (line 141 of /Applications/MAMP/htdocs/drupal/sites/all/modules/lang_dropdown/lang_dropdown.module).

It seems to be the same issue than here : #1027054: No icons are showing - Add a check to see if it is necessary to fix anything before assigning a new object