How to use the textfsm.parser.TextFSMTemplateError function in textfsm

line = line.decode('utf-8')
      # Skip commented lines.
      if self.comment_regex.match(line):
        continue

      if line.startswith('Value '):
        try:
          value = TextFSMValue(
              fsm=self, max_name_len=self.MAX_NAME_LEN,
              options_class=self._options_cls)
          value.Parse(line)
        except TextFSMTemplateError as error:
          raise TextFSMTemplateError('%s Line %s.' % (error, self._line_num))

        if value.name in self.header:
          raise TextFSMTemplateError(
              "Duplicate declarations for Value '%s'. Line: %s."
              % (value.name, self._line_num))

        try:
          self._ValidateOptions(value)
        except TextFSMTemplateError as error:
          raise TextFSMTemplateError('%s Line %s.' % (error, self._line_num))

        self.values.append(value)
        self.value_map[value.name] = value.template
      # The line has text but without the 'Value ' prefix.
      elif not self.values:
        raise TextFSMTemplateError('No Value definitions found.')
      else:
        raise TextFSMTemplateError(
            'Expected blank line after last Value entry. Line: %s.'

if value.name in self.header:
          raise TextFSMTemplateError(
              "Duplicate declarations for Value '%s'. Line: %s."
              % (value.name, self._line_num))

        try:
          self._ValidateOptions(value)
        except TextFSMTemplateError as error:
          raise TextFSMTemplateError('%s Line %s.' % (error, self._line_num))

        self.values.append(value)
        self.value_map[value.name] = value.template
      # The line has text but without the 'Value ' prefix.
      elif not self.values:
        raise TextFSMTemplateError('No Value definitions found.')
      else:
        raise TextFSMTemplateError(
            'Expected blank line after last Value entry. Line: %s.'
            % (self._line_num))

name: (str), the name of the Option to add.

    Raises:
      TextFSMTemplateError: If option is already present or
        the option does not exist.
    """

    # Check for duplicate option declaration
    if name in [option.name for option in self.options]:
      raise TextFSMTemplateError('Duplicate option "%s"' % name)

    # Create the option object
    try:
      option = self._options_cls.GetOption(name)(self)
    except AttributeError:
      raise TextFSMTemplateError('Unknown option "%s"' % name)

    self.options.append(option)

def _Parse(self, template):
    """Parses template file for FSM structure.

    Args:
      template: Valid template file.

    Raises:
      TextFSMTemplateError: If template file syntax is invalid.
    """

    if not template:
      raise TextFSMTemplateError('Null template.')

    # Parse header with Variables.
    self._ParseFSMVariables(template)

    # Parse States.
    while self._ParseFSMState(template):
      pass

    # Validate destination states.
    self._ValidateFSM()

Each destination state must exist, be a valid name and
    not be a reserved name.
    There must be a 'Start' state and if 'EOF' or 'End' states are specified,
    they must be empty.

    Returns:
      True if FSM is valid.

    Raises:
      TextFSMTemplateError: If any state definitions are invalid.
    """

    # Must have 'Start' state.
    if 'Start' not in self.states:
      raise TextFSMTemplateError("Missing state 'Start'.")

    # 'End/EOF' state (if specified) must be empty.
    if self.states.get('End'):
      raise TextFSMTemplateError("Non-Empty 'End' state.")

    if self.states.get('EOF'):
      raise TextFSMTemplateError("Non-Empty 'EOF' state.")

    # Remove 'End' state.
    if 'End' in self.states:
      del self.states['End']
      self.state_list.remove('End')

    # Ensure jump states are all valid.
    for state in self.states:
      for rule in self.states[state]:

True if FSM is valid.

    Raises:
      TextFSMTemplateError: If any state definitions are invalid.
    """

    # Must have 'Start' state.
    if 'Start' not in self.states:
      raise TextFSMTemplateError("Missing state 'Start'.")

    # 'End/EOF' state (if specified) must be empty.
    if self.states.get('End'):
      raise TextFSMTemplateError("Non-Empty 'End' state.")

    if self.states.get('EOF'):
      raise TextFSMTemplateError("Non-Empty 'EOF' state.")

    # Remove 'End' state.
    if 'End' in self.states:
      del self.states['End']
      self.state_list.remove('End')

    # Ensure jump states are all valid.
    for state in self.states:
      for rule in self.states[state]:
        if rule.line_op == 'Error':
          continue

        if not rule.new_state or rule.new_state in ('End', 'EOF'):
          continue

        if rule.new_state not in self.states:

they must be empty.

    Returns:
      True if FSM is valid.

    Raises:
      TextFSMTemplateError: If any state definitions are invalid.
    """

    # Must have 'Start' state.
    if 'Start' not in self.states:
      raise TextFSMTemplateError("Missing state 'Start'.")

    # 'End/EOF' state (if specified) must be empty.
    if self.states.get('End'):
      raise TextFSMTemplateError("Non-Empty 'End' state.")

    if self.states.get('EOF'):
      raise TextFSMTemplateError("Non-Empty 'EOF' state.")

    # Remove 'End' state.
    if 'End' in self.states:
      del self.states['End']
      self.state_list.remove('End')

    # Ensure jump states are all valid.
    for state in self.states:
      for rule in self.states[state]:
        if rule.line_op == 'Error':
          continue

        if not rule.new_state or rule.new_state in ('End', 'EOF'):