How to use the letsencrypt.errors.MisconfigurationError function in letsencrypt

def config_test(self):  # pylint: disable=no-self-use
        """Check the configuration of Apache for errors.

        :raises .errors.MisconfigurationError: If config_test fails

        """
        try:
            le_util.run_script(constants.os_constant("conftest_cmd"))
        except errors.SubprocessError as err:
            raise errors.MisconfigurationError(str(err))

def _add_directive(block, directive, replace):
    """Adds or replaces a single directive in a config block.

    See _add_directives for more documentation.

    """
    location = -1
    # Find the index of a config line where the name of the directive matches
    # the name of the directive we want to add.
    for index, line in enumerate(block):
        if len(line) > 0 and line[0] == directive[0]:
            location = index
            break
    if replace:
        if location == -1:
            raise errors.MisconfigurationError(
                'expected directive for %s in the Nginx '
                'config but did not find it.' % directive[0])
        block[location] = directive
    else:
        # Append directive. Fail if the name is not a repeatable directive name,
        # and there is already a copy of that directive with a different value
        # in the config file.
        directive_name = directive[0]
        directive_value = directive[1]
        if location != -1 and directive_name.__str__() not in repeatable_directives:
            if block[location][1] == directive_value:
                # There's a conflict, but the existing value matches the one we
                # want to insert, so it's fine.
                pass
            else:
                raise errors.MisconfigurationError(

def _reload(self):
        """Reloads the Apache server.

        :raises .errors.MisconfigurationError: If reload fails

        """
        try:
            le_util.run_script(constants.os_constant("restart_cmd"))
        except errors.SubprocessError as err:
            raise errors.MisconfigurationError(str(err))

def _enable_mod_debian(self, mod_name, temp):
        """Assumes mods-available, mods-enabled layout."""
        # Generate reversal command.
        # Try to be safe here... check that we can probably reverse before
        # applying enmod command
        if not le_util.exe_exists(self.conf("dismod")):
            raise errors.MisconfigurationError(
                "Unable to find a2dismod, please make sure a2enmod and "
                "a2dismod are configured correctly for letsencrypt.")

        self.reverter.register_undo_command(
            temp, [self.conf("dismod"), mod_name])
        le_util.run_script([self.conf("enmod"), mod_name])

def perform(self, achalls):  # pylint: disable=missing-docstring
        if any(util.already_listening(port) for port in self._necessary_ports):
            raise errors.MisconfigurationError(
                "At least one of the (possibly) required ports is "
                "already taken.")

        try:
            return self.perform2(achalls)
        except errors.StandaloneBindError as error:
            display = zope.component.getUtility(interfaces.IDisplay)

            if error.socket_error.errno == socket.errno.EACCES:
                display.notification(
                    "Could not bind TCP port {0} because you don't have "
                    "the appropriate permissions (for example, you "
                    "aren't running this program as "
                    "root).".format(error.port))
            elif error.socket_error.errno == socket.errno.EADDRINUSE:
                display.notification(

block exists already.

        ..todo :: Doesn't match server blocks whose server_name directives are
            split across multiple conf files.

        :param str filename: The absolute filename of the config file
        :param set names: The server_name to match
        :param list directives: The directives to add
        :param bool replace: Whether to only replace existing directives

        """
        try:
            _do_for_subarray(self.parsed[filename],
                             lambda x: self._has_server_names(x, names),
                             lambda x: _add_directives(x, directives, replace))
        except errors.MisconfigurationError as err:
            raise errors.MisconfigurationError("Problem in %s: %s" % (filename, err.message))