# Buggy code
def _collect_dir(self, path_info, **kwargs):
    file_infos = set()

    for fname in self.walk_files(path_info, **kwargs):
        if DvcIgnore.DVCIGNORE_FILE == fname.name:
            raise DvcIgnoreInCollectedDirError(fname.parent)

        file_infos.add(fname)

    hashes = {fi: self.state.get(fi) for fi in file_infos}
    not_in_state = {fi for fi, hash_ in hashes.items() if hash_ is None}

    new_hashes = self._calculate_hashes(not_in_state)
    hashes.update(new_hashes)

    result = [
        {
            self.PARAM_CHECKSUM: hashes[fi],
            # NOTE: this is lossy transformation:
            #   "hey\there" -> "hey/there"
            #   "hey/there" -> "hey/there"
            # The latter is fine filename on Windows, which
            # will transform to dir/file on back transform.
            #
            # Yes, this is a BUG, as long as we permit "/" in
            # filenames on Windows and "\" on Unix
            self.PARAM_RELPATH: fi.relative_to(path_info).as_posix(),
        }
        for fi in file_infos
    ]

    # Sorting the list by path to ensure reproducibility
    return sorted(result, key=itemgetter(self.PARAM_RELPATH))


# Traceback (dvc.exceptions.RemoteCacheRequiredError)
2020-07-01 17:14:02,947 DEBUG: fetched: [(3,)]
2020-07-01 17:14:03,123 DEBUG: Removing output 'some_target' of stage: 'some_target.dvc'.
Importing 's3://some_bucket/some_target' -> 'some_target'
2020-07-01 17:14:03,123 DEBUG: Computed stage: 'some_target.dvc' md5: '2f8b87d3b22efd1638f414c3b3f65614'
2020-07-01 17:14:03,123 DEBUG: 'md5' of stage: 'some_target.dvc' changed.
2020-07-01 17:14:04,088 DEBUG: fetched: [(0,)]
2020-07-01 17:14:04,146 ERROR: failed to import s3://some_bucket/some_target. You could also try downloading it manually, and adding it with `dvc add`. - Current operation was unsuccessful because 's3://some_bucket/some_target' requires existing cache on 's3' remote. See <https://man.dvc.org/config#cache> for information on how to set up remote cache.
------------------------------------------------------------
Traceback (most recent call last):
File "/usr/lib/python3.8/site-packages/dvc/command/imp_url.py", line 14, in run
self.repo.imp_url(
File "/usr/lib/python3.8/site-packages/dvc/repo/__init__.py", line 36, in wrapper
ret = f(repo, *args, **kwargs)
File "/usr/lib/python3.8/site-packages/dvc/repo/scm_context.py", line 4, in run
result = method(repo, *args, **kw)
File "/usr/lib/python3.8/site-packages/dvc/repo/imp_url.py", line 54, in imp_url
stage.run()
File "/home/anotherbugmaster/.local/lib/python3.8/site-packages/funcy/decorators.py", line 39, in wrapper
return deco(call, *dargs, **dkwargs)
File "/usr/lib/python3.8/site-packages/dvc/stage/decorators.py", line 35, in rwlocked
return call()
File "/home/anotherbugmaster/.local/lib/python3.8/site-packages/funcy/decorators.py", line 60, in __call__
return self._func(*self._args, **self._kwargs)
File "/usr/lib/python3.8/site-packages/dvc/stage/__init__.py", line 424, in run
sync_import(self, dry, force)
File "/usr/lib/python3.8/site-packages/dvc/stage/imports.py", line 29, in sync_import
stage.save_deps()
File "/usr/lib/python3.8/site-packages/dvc/stage/__init__.py", line 387, in save_deps
dep.save()
File "/usr/lib/python3.8/site-packages/dvc/output/base.py", line 268, in save
self.info = self.save_info()
File "/usr/lib/python3.8/site-packages/dvc/output/base.py", line 192, in save_info
return self.remote.save_info(self.path_info)
File "/usr/lib/python3.8/site-packages/dvc/remote/base.py", line 762, in save_info
return self.tree.save_info(path_info, **kwargs)
File "/usr/lib/python3.8/site-packages/dvc/remote/base.py", line 329, in save_info
self.PARAM_CHECKSUM: self.get_hash(path_info, tree=tree, **kwargs)
File "/usr/lib/python3.8/site-packages/dvc/remote/base.py", line 297, in get_hash
hash_ = self.get_dir_hash(path_info, tree, **kwargs)
File "/usr/lib/python3.8/site-packages/dvc/remote/base.py", line 311, in get_dir_hash
raise RemoteCacheRequiredError(path_info)
dvc.exceptions.RemoteCacheRequiredError: Current operation was unsuccessful because 's3://some_bucket/some_target' requires existing cache on 's3' remote. See <https://man.dvc.org/config#cache> for information on how to set up remote cache.
------------------------------------------------------------

Having any troubles? Hit us up at https://dvc.org/support, we are always happy to help!

# Fixed code
def _collect_dir(self, path_info, **kwargs):
    file_infos = set()

    for fname in self.walk_files(path_info, **kwargs):
        if DvcIgnore.DVCIGNORE_FILE == fname.name:
            raise DvcIgnoreInCollectedDirError(fname.parent)

        file_infos.add(fname)

    hashes = {fi: self.state.get(fi) for fi in file_infos}
    not_in_state = {fi for fi, hash_ in hashes.items() if hash_ is None}

    new_hashes = self._calculate_hashes(not_in_state)
    hashes.update(new_hashes)

    return [
        {
            self.PARAM_CHECKSUM: hashes[fi],
            # NOTE: this is lossy transformation:
            #   "hey\there" -> "hey/there"
            #   "hey/there" -> "hey/there"
            # The latter is fine filename on Windows, which
            # will transform to dir/file on back transform.
            #
            # Yes, this is a BUG, as long as we permit "/" in
            # filenames on Windows and "\" on Unix
            self.PARAM_RELPATH: fi.relative_to(path_info).as_posix(),
        }
        for fi in file_infos
    ]