'Mark an episode as failed
:param epObj: Episode object to mark as failed
:return: empty string'

@staticmethod
def markFailed(epObj):

    log_str = u''
    try:
        with epObj.lock:
            quality = Quality.splitCompositeStatus(epObj.status)[1]
            epObj.status = Quality.compositeStatus(FAILED, quality)
            epObj.saveToDB()
    except EpisodeNotFoundException as e:
        sickrage.srCore.srLogger.warning(u'Unable    to    get    episode,    please    set    its    status    manually:    {}'.format(e.message))
    return log_str
