# Buggy code
async def _load_repos(self, set=False) -> MutableMapping[str, Repo]:
    ret = {}
    self.repos_folder.mkdir(parents=True, exist_ok=True)
    for folder in self.repos_folder.iterdir():
        if not folder.is_dir():
            continue
        try:
            ret[folder.stem] = await Repo.from_folder(folder)
        except RuntimeError:
            # Thrown when there's no findable git remote URL
            pass

    if set:
        self._repos = ret
    return ret


# Traceback (UnicodeDecodeError)
Task exception was never retrieved
future: <Task finished coro=<RepoManager._load_repos() done, defined at /home/aikaterna/v3/lib/python3.6/site-packages/redbot/cogs/downloader/repo_manager.py:618> exception=UnicodeDecodeError('utf-8', b"\x01D\xc79\x12b\x9e\xd6\xa4\xb8\x13\x93TDR \xe3w\xd3@\xc4H$H=2\x0e48\xac\xa6V\xb2\xb3\x19\x1cu\xe9\xed\xae'\xac\xb2\xe7!j\xc7^\xb1\xca\xe2\xa6\xd8\xa8\x9e\xd8\xad\x95\xe6\xa7v)\x9a\x81\xef\xdc\xa2h\x9c~\xba&amp;\xc6G\x1d\x1c\x80\xc3\x10\xd7\xda\x96\xc7\x885$\xc0,\xb3\x12\x18\x89\xec\xb5\xa9e\x8ax1\x91\xc7\\\xa2\x04\x879\x14\xc3\x8a\xcaek*\xda\x9d\xda&amp;\xc6G\x1dL\x01\x92\xc6G\x1dr\x89\xa2r:$z", 2, 3, 'invalid continuation byte')>
Traceback (most recent call last):
File "/home/aikaterna/v3/lib/python3.6/site-packages/redbot/cogs/downloader/repo_manager.py", line 621, in _load_repos
ret[folder.stem] = await Repo.from_folder(folder)
File "/home/aikaterna/v3/lib/python3.6/site-packages/redbot/cogs/downloader/repo_manager.py", line 487, in from_folder
repo._update_available_modules()
File "/home/aikaterna/v3/lib/python3.6/site-packages/redbot/cogs/downloader/repo_manager.py", line 153, in _update_available_modules
curr_modules.append(Installable(location=self.folder_path / name))
File "/home/aikaterna/v3/lib/python3.6/site-packages/redbot/cogs/downloader/installable.py", line 68, in __init__
super().__init__(location)
File "/home/aikaterna/v3/lib/python3.6/site-packages/redbot/cogs/downloader/json_mixins.py", line 18, in __init__
self._read_info_file()
File "/home/aikaterna/v3/lib/python3.6/site-packages/redbot/cogs/downloader/installable.py", line 125, in _read_info_file
super()._read_info_file()
File "/home/aikaterna/v3/lib/python3.6/site-packages/redbot/cogs/downloader/json_mixins.py", line 28, in _read_info_file
info = json.load(f)
File "/usr/lib/python3.6/json/__init__.py", line 296, in load
return loads(fp.read(),
File "/home/aikaterna/v3/lib/python3.6/codecs.py", line 321, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc7 in position 2: invalid continuation byte

# Fixed code
async def _load_repos(self, set=False) -> MutableMapping[str, Repo]:
    ret = {}
    self.repos_folder.mkdir(parents=True, exist_ok=True)
    for folder in self.repos_folder.iterdir():
        if not folder.is_dir():
            continue
        try:
            ret[folder.stem] = await Repo.from_folder(folder)
        except errors.NoRemoteURL:
            log.warning("A remote URL does not exist for repo %s", folder.stem)
        except errors.DownloaderException as err:
            log.error("Discarding repo %s due to error.", folder.stem, exc_info=err)
            shutil.rmtree(
                str(folder),
                onerror=lambda func, path, exc: log.error(
                    "Failed to remove folder %s", path, exc_info=exc
                ),
            )

    if set:
        self._repos = ret
    return ret