How to use the dockerflow.checks.Error function in dockerflow

try:
        if q is not None:
            if q.size > 0:
                return [
                    checks.Info(
                        "queue contains pending messages", id=QUEUE_PENDING_INFO_ID
                    )
                ]
            elif q.unack_count() > 0:
                return [
                    checks.Info(
                        "queue contains unacked messages", id=QUEUE_UNACKED_INFO_ID
                    )
                ]
    except Exception:
        return [checks.Error("queue raised exception on access", id=QUEUE_ERROR_ID)]
    else:
        return []

def check_disk_bytes_free(app: Sanic, q: SQLiteAckQueue):
    """Check disk for QUEUE_PATH has minimum amount of bytes free."""
    threshold = app.config.get("MINIMUM_DISK_FREE_BYTES")

    if None in (q, threshold) or q.path in (None, ":memory:"):
        return []

    try:
        status = os.statvfs(q.path)
    except FileNotFoundError:
        return [checks.Warning("queue path does not exist", id=NO_QUEUE_WARNING_ID)]

    bytes_free = status.f_bfree * status.f_frsize
    if bytes_free < threshold:
        return [checks.Error("disk bytes free below threshold", id=LOW_DISK_ERROR_ID)]
    else:
        return []