My team and I have been crawling both the net and Facebook Docs for answers, but for some reason there are no valid answers to our question. 

So we desperately hope for help from someone here

We are trying to create a video AD on facebook. Upload is done and we are at the step where we need to create the creative through /adcreatives endpoint. 

Below is the body of the POST : 
<https://graph.facebook.com/v2.8/act_[account_id]/adcreatives>

```
 {
      "access_token": "token_that_is_valid",
      "object_story_spec": {
        "page_id": "valid_numeric_page_id",
        "video_data":{
          "image_url": "link_to_img",
            "video_id": "valid_numeric_video_id",
            "call_to_action" :{
                "type": "LEARN_MORE",
                "value":{
                    "link": "my_link",
                    "link_caption":"my_link_caption",
                    "link_description": "description"
                }
            }
       }

      },
      "name":"jjkkllkjljl"
    }

```

The response from facebook is rather worrying : 

```
{
    "error": {
        "message": "Invalid parameter",
        "type": "OAuthException",
        "code": 100,
        "error_subcode": 1487390,
        "is_transient": false,
        "error_user_title": "Adcreative Create Failed",
        "error_user_msg": "The Adcreative Create Failed for the following reason: Oops, something went wrong. Please try again later",
        "fbtrace_id": "EVL6GYOOtYi"
    }
}

```

Also as an extra info, creating both non-video / image creatives and herafter ads is not an issue. Posting pre uploaded videos to a page is NOT an issue. All access rights has been given to the Facebook APP.

Thank you for taking the time to look at this.