<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def normalizeDefaultLayerName(value, font):
 """ Normalizes default layer name. * **value** must normalize as layer name with :func:`normalizeLayerName`. * **value** must be a layer in **font**. * Returned value will be an unencoded ``unicode`` string. """

    value = normalizeLayerName(value)
    if value not in font.layerOrder:
        raise ValueError("No layer with the name '%s' exists." % value)
    return unicode(value)