使用features，报错ERROR - qlib.workflow - [utils.py:41] - An exception has been raised[UnicodeEncodeError: 'ascii' codec can't encode characters in position 18-20: ordinal not in range(128)]

[Liumh-01]

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ERROR - qlib.workflow - [utils.py:41] - An exception has been raised[UnicodeEncodeError: 'ascii' codec can't encode characters in position 18-20: ordinal not in range(128)]

[SunsetWolf]

Hi, @Liumh-01
How can we reproduce your issue?

[Liumh-01]

@SunsetWolf
Thanks for your reply
import qlib
from qlib.data import D
qlib.init(provider_uri = "data/qlib_demo_data")
all_code = D.list_instruments(D.instruments("all"),as_list=True)
returns = D.features(instruments=all_code,fields=["$close/Ref($close,1)-1"],start_time='2023-02-01',end_time='2024-09-13',freq='day')
print(returns) when instruments = one specific stock code,there is no problem,when i want to let instruments = more than one stock code,it will report errors:ERROR - qlib.workflow - [utils.py:41] - An exception has been raised[UnicodeEncodeError: 'ascii' codec can't encode characters in position 18-20: ordinal not in range(128)]

[SunsetWolf]

Hi, @Liumh-01
We now understand your code, and it looks good. We would like to know what the data pointed to by the path data/qlib_demo_data in your code looks like.

[Liumh-01]

@SunsetWolf ，Hi,
the path is created from following way:
import qlib
from qlib.tests.data import GetData
data_uri = 'data/qlib_demo_data'
qlib.init(provider_uri=data_uri, region="cn")
GetData().qlib_data(target_dir=data_uri, region='cn')
so,the data/qlib_demo_data is satisfied with the format that qlib required