undefined function visibility_api_form_configuration()

i get this error after install Visibility API 6.x-1.0

Fatal error: Call to undefined function visibility_api_form_configuration() in /home/public_html/modules/firestats/firestats.module on line 116
array(4) { ["type"]=> int(1) ["message"]=> string(62) "Call to undefined function visibility_api_form_configuration()" ["file"]=> string(60) "/home/public_html/modules/firestats/firestats.module" ["line"]=> int(116) } n/a