How to use the pkgcore.log.logger.error function in pkgcore

fp = pjoin(self.profiles_base, name)
        try:
            for line in iter_read_bash(fp):
                try:
                    key, val = line.split(None, 1)
                    key = converter(key)
                    if matcher:
                        yield key[0], (key[1], val.split('-', 1)[1].strip())
                    else:
                        yield key, val.split('-', 1)[1].strip()
                except ValueError as e:
                    logger.error(f'failed parsing {fp!r}, line {line!r}: {e}')
        except FileNotFoundError:
            pass
        except ValueError as e:
            logger.error(f'failed parsing {fp!r}: {e}')

def _parse_package_use(self, data):
        d = defaultdict(list)
        # split the data down ordered cat/pkg lines
        for line, lineno, path in data:
            l = line.split()
            try:
                a = self.eapi_atom(l[0])
            except ebuild_errors.MalformedAtom as e:
                logger.error(e)
                continue
            if len(l) == 1:
                logger.error(f'{path!r}, line {lineno}: missing USE flag(s): {line!r}')
                continue
            d[a.key].append(misc.chunked_data(a, *split_negations(l[1:])))

        return ImmutableDict((k, misc._build_cp_atom_payload(v, atom(k)))
                             for k, v in d.items())

projects = {}
        for p in tree.findall('project'):
            kwargs = {}
            for k in ('email', 'name', 'url', 'description'):
                kwargs[k] = p.findtext(k)

            members = []
            for m in p.findall('member'):
                m_kwargs = {}
                for k in ('email', 'name', 'role'):
                    m_kwargs[k] = m.findtext(k)
                m_kwargs['is_lead'] = m.get('is-lead', '') == '1'
                try:
                    members.append(ProjectMember(**m_kwargs))
                except ValueError:
                    logger.error(f"project {kwargs['email']} has  with no email")
            kwargs['members'] = members

            subprojects = []
            for sp in p.findall('subproject'):
                try:
                    subprojects.append(Subproject(
                        ref=sp.get('ref'),
                        inherit_members=sp.get('inherit-members', '') == '1',
                        projects_xml=self))
                except ValueError:
                    logger.error(f"project {kwargs['email']} has  with no ref")
            kwargs['subprojects'] = subprojects

            projects[kwargs['email']] = Project(**kwargs)

        return mappings.ImmutableDict(projects)

handlers["SIGTERM"] = chuck_TermInterrupt
        handlers["dying"] = chuck_DyingInterrupt

        if additional_commands is not None:
            for x in additional_commands:
                if not callable(additional_commands[x]):
                    raise TypeError(additional_commands[x])

            handlers.update(additional_commands)

        self.lock()

        try:
            if self._outstanding_expects:
                if not self._consume_async_expects():
                    logger.error("error in daemon")
                    raise UnhandledCommand("expects out of alignment")
            while True:
                line = self.read().strip()
                # split on first whitespace
                cmd, _, args_str = line.partition(' ')
                if not cmd:
                    raise InternalError(
                        f"Expected command; instead got nothing from {line!r}")
                if cmd in handlers:
                    args = []
                    if args_str:
                        args.append(args_str)
                    # TODO: handle exceptions raised from handlers better
                    handlers[cmd](self, *args)
                else:
                    logger.error(f"unhandled command {cmd!r}, line {line!r}")

def _process_plugin(package, plug, filter_disabled=False):
    if isinstance(plug.target, str):
        plug = modules.load_any(plug.target)
    elif isinstance(plug.target, int):
        module = modules.load_any(plug.source)
        plugs = getattr(module, PLUGIN_ATTR, {})
        plugs = plugs.get(plug.key, [])
        if len(plugs) <= plug.target:
            logger.exception(
                "plugin cache for %s, %s, %s is somehow wrong; no item at position %s",
                package.__name__, plug.source, plug.key, plug.target)
            return None
        plug = plugs[plug.target]
    else:
        logger.error(
            "package %s, plug %s; non int, non string.  wtf?",
            package.__name__, plug)
        return None

    if filter_disabled:
        if getattr(plug, 'disabled', False):
            logger.debug("plugin %s is disabled, skipping", plug)
            return None
        f = getattr(plug, '_plugin_disabled_check', None)
        if f is not None and f():
            logger.debug("plugin %s is disabled, skipping", plug)
            return None

    return plug

def _scan_directory(path):
    files = []
    for filename in listdir_files(path):
        match = valid_updates_re.match(filename)
        if match is not None:
            files.append(((match.group(2), match.group(1)), filename))
        else:
            logger.error(f'incorrectly named update file: {filename!r}')
    files.sort(key=itemgetter(0))
    return [x[1] for x in files]

def _parse_cpv(s):
            try:
                return cpv.VersionedCPV(s)
            except cpv.InvalidCPV:
                logger.error(f'invalid package.provided entry: {s!r}')
        data = (x[0] for x in data)