how to add comment via facebook connect on iphone

I have been trying to use the comments.add REST api me开发者_StackOverflowthod to add comments to objects. I have all the publish_stream permissions and access_token's but its coming back with a 805.

Anyone know how to get it to work? I'm trying to comment on a photo and I'm passing in its object_id.

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I was using the pid instead of the object_id! It now works.