I was getting the same error because I was trying to create the tweet before the video was done being processed by twitter. I had to add the following after the code for FINALIZE:
$videoCount = 0;
do
{
$tmhOAuth->request(
'GET',
$tmhOAuth->url('/1.1/media/upload.json'),
array(
"command" => "STATUS",
"media_id" => $mediaID,
)
);
$twitterResult = json_decode($tmhOAuth->response['response']);
if ($twitterResult->processing_info->state != 'succeeded')
{ sleep(5); }
$videoCount++;
}
while ($twitterResult->processing_info->state != 'succeeded' && $videoCount < 5);