facebook invalid scopes code example

Example: Facebook Login Error Invalid Scope

'Facebook' => [
					'enabled' => $enable_facebook_login,
					'keys'    => [ 'id' => $facebook_app_id, 'secret' => $facebook_app_secret ],
					'scope'   => [ 'email' ]
				],

change to

'scope'   => 'email'

this fixed my issue 
i hope it works for you roo