Failed to post link. Status code: 501, Response: {"error":"MethodNotImplemented","message":"Method Not Implemented"}

[chronic8000]

"Failed to post link. Status code: 501, Response: {"error":"MethodNotImplemented","message":"Method Not Implemented"}"

When I try using the API with your own documentation using Python to create a post and upload an image, I can create text posts fine but when I try to add an image whether PNG or JPEG i get that error.