NoCredentialsError: Unable to locate credentials

Hi, thank you for sharing the wonderful work for processing objaverse dataset. However, I was wondering why the following problem happens. Thanks!
```

(zero123)@ece-a51951:/ssd1/projects/zero123/objaverse-rendering$ python3 scripts/download_objaverse.py --start_i 0 --end_i 100
798759
0it [00:00, ?it/s]
Traceback (most recent call last):
File "/ssd1/projects/zero123/objaverse-rendering/scripts/download_objaverse.py", line 57, in
completed_uids = get_completed_uids()
File "/ssd1/projects/zero123/objaverse-rendering/scripts/download_objaverse.py", line 29, in get_completed_uids
bucket_files = [obj.key for obj in tqdm(bucket.objects.all())]
File "/ssd1/projects/zero123/objaverse-rendering/scripts/download_objaverse.py", line 29, in
bucket_files = [obj.key for obj in tqdm(bucket.objects.all())]
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/tqdm/std.py", line 1178, in __iter__
for obj in iterable:
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/boto3/resources/collection.py", line 81, in __iter__
for page in self.pages():
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/boto3/resources/collection.py", line 171, in pages
for page in pages:
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/paginate.py", line 269, in __iter__
response = self._make_request(current_kwargs)
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/paginate.py", line 357, in _make_request
return self._method(**current_kwargs)
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/client.py", line 530, in _api_call
return self._make_api_call(operation_name, kwargs)
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/client.py", line 943, in _make_api_call
http, parsed_response = self._make_request(
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/client.py", line 966, in _make_request
return self._endpoint.make_request(operation_model, request_dict)
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/endpoint.py", line 119, in make_request
return self._send_request(request_dict, operation_model)
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/endpoint.py", line 198, in _send_request
request = self.create_request(request_dict, operation_model)
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/endpoint.py", line 134, in create_request
self._event_emitter.emit(
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/hooks.py", line 412, in emit
return self._emitter.emit(aliased_event_name, **kwargs)
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/hooks.py", line 256, in emit
return self._emit(event_name, kwargs)
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/hooks.py", line 239, in _emit
response = handler(**kwargs)
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/signers.py", line 105, in handler
return self.sign(operation_name, request)
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/signers.py", line 189, in sign
auth.add_auth(request)
File "/ssd1/anaconda3/envs/zero123/lib/python3.9/site-packages/botocore/auth.py", line 418, in add_auth
raise NoCredentialsError()
botocore.exceptions.NoCredentialsError: Unable to locate credentials
```