Can't load new exports, but can load old ones. ValueError: Extra data: about slack-export-viewer HOT 4 CLOSED

                    day_messages = json.load(f)
                except ValueError as v:
                    print "Error ",v," with data ",f

[
    {
        "user": "U06TFPM3K",
        "text": "<@U06TFPM3K> has joined the channel",
        "type": "message",
        "subtype": "channel_join",
        "ts": "1484049182.000002"
    },
    {
        "user": "U193Y8EH1",
        "inviter": "U06TFPM3K",
        "text": "<@U193Y8EH1> has joined the channel",
        "type": "message",
        "subtype": "channel_join",
        "ts": "1484049182.000003"
    },
    {
        "user": "U3PGV4H3N",
        "inviter": "U06TFPM3K",
        "text": "<@U3PGV4H3N> has joined the channel",
        "type": "message",
        "subtype": "channel_join",
        "ts": "1484049183.000004"
    },
    {
        "user": "U06TFPM3K",
        "topic": "Pingpad can help you capture shared knowledge, organize and act on it. I will save Posts and Pinned messages as wiki pages automatically for you to <https:\/\/pingpad.io>. Say `help` to get started.",
        "text": "<@U06TFPM3K> set the channel topic: Pingpad can help you capture shared knowledge, organize and act on it. I will save Posts and Pinned messages as wiki pages automatically for you to <https:\/\/pingpad.io>. Say `help` to get
 started.",
        "type": "message",
        "subtype": "channel_topic",
        "ts": "1484049183.000005"
    }
][
    {
        "user": "U06TFPM3K",
        "text": "<@U06TFPM3K> has joined the channel",
        "type": "message",
        "subtype": "channel_join",
        "ts": "1484049182.000002"
    },
    {
        "user": "U193Y8EH1",
        "inviter": "U06TFPM3K",
        "text": "<@U193Y8EH1> has joined the channel",
        "type": "message",
        "subtype": "channel_join",
        "ts": "1484049182.000003"
    },
    {
        "user": "U06TFPM3K",
        "members": [
            "U06TFPM3K",
            "U193Y8EH1"
        ],
        "text": "<@U06TFPM3K> archived the channel",
        "type": "message",
        "subtype": "channel_archive",
        "ts": "1484049183.000004"
    }
]