HelloSign file_error error due to the overlay - this applies to all signature request types except the appended signatures page

Overlay Error

{
    "event":{
        "event_type":"file_error",
        "event_time":"1512604001",
        "event_hash":"3ab427feca126d46e77836507fbb4a3811c710a1271333339f2e02b2adcfcd91",
        "event_metadata":{
            "related_signature_id":null,
            "reported_for_account_id":"bc1555e28a648231a589117cb739f17c82d80411",
            "reported_for_app_id":null
        }
    },
    "account_guid":"bc1555e28a648231a589117cb739f17c82d80411",
    "client_id":null,
    "signature_request":{
        "signature_request_id":"01e4ddde46cedc959ab019b196487374548f1672",
        "test_mode":true,
        "title":"using postman",
        "original_title":"using postman",
        "subject":"using postman",
        "message":"Three Signers multiple pages",
        "metadata":{

        },
        "is_complete":false,
        "is_declined":false,
        "has_error":false,
        "custom_fields":[

        ],
        "response_data":[

        ],
        "signing_url":null,
        "signing_redirect_url":null,
        "final_copy_uri":"\/v3\/signature_request\/final_copy\/01e4ddde46cedc959ab019b196487374548f1672",
        "files_url":"https:\/\/api.hellosign.com\/v3\/signature_request\/files\/01e4ddde46cedc959ab019b196487374548f1672",
        "details_url":"https:\/\/app.hellosign.com\/home\/manage?guid=01e4ddde46cedc959ab019b196487374548f1672",
        "requester_email_address":"alex@hellosign.com",
        "signatures":[
            {
                "signature_id":"30ce57341d5e28197f35c52a915285ed",
                "has_pin":false,
                "signer_email_address":"testing+overlayerror@hellosign.com",
                "signer_name":"Mr Postman",
                "order":null,
                "status_code":"awaiting_signature",
                "signed_at":null,
                "last_viewed_at":null,
                "last_reminded_at":null,
                "error":null
            }
        ],
        "cc_email_addresses":[

        ]
    }
}