schedule image post on facebook page

I am trying to schedule a photo on facebook page as page. When i try to schedule only message then it works but when i give the source of image then it gives error Graph returned an error: An unexpected error has occurred. Please retry your request later.

$image = url().'/images/logo.png';

$data = [ 'message' => 'new schedule 1',

'source' => $image,

'published' => 0,

'scheduled_publish_time' => $epochTime

];

$response = $fb->post('/949206005163395/feed', $data, $pageAccessToken);

Please help

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