return NS_ERROR_NOT_IMPLEMENTED;
icalparameter_kind paramkind = icalparameter_string_to_kind(PromiseFlatCString(param).get());  if (paramkind == ICAL_NO_PARAMETER || paramkind == ICAL_X_PARAMETER) return NS_ERROR_INVALID_ARG;  icalproperty_remove_parameter(mProperty, paramkind);  return NS_OK;
calIcalProperty::RemoveParameter(PRInt32 kind){    return NS_ERROR_NOT_IMPLEMENTED;}