Pinterest could not fetch the image

Pinterest could not fetch the image

Trying to implement the "pin it" button but it returns the following
problem for every single image. We use SSL across the whole site and I'm
wondering if this is related.
Any idea?
{"route_pattern": "^/resource/:name/:method/$", "error":
{"api_error_code": 1, "message": "Sorry we could not fetch the image.",
"code": "API_ERROR", "target": "<webapp.resources.pin_resource.PinResource
object at 0xb851c50>", "http_status": 400}, "resource": {"name":
"PinResource", "options": {"board_id": "393150311159619967",
"description": "Kokeshi - Samoura\u00ef Bento", "link":
"https://bentooo.com/products/kokeshi-samourai-bento", "image_url":
"https://bentooo.com/upload/pictures/884/thumb/IMG_0704.jpg", "bookmarks":
["-end-"], "is_video": null, "method": "button"}}, "client_context":
{"app_version": "5bdef68"}, "resource_response": {"data": null, "error":
{"api_error_code": 1, "message": "Sorry we could not fetch the image.",
"code": "API_ERROR", "target": "<webapp.resources.pin_resource.PinResource
object at 0xb851c50>", "http_status": 400}}}