No module named 'qtrade_client'

[longlu]

qtrader/qapi.py", line 1, in
from qtrade_client.api import QtradeAPI
ModuleNotFoundError: No module named 'qtrade_client'

[longlu]

just installed it
but

/qtrader/qapi.py", line 323, in
confile_contents = json.loads(confile.read())
File "/usr/lib/python3.9/json/init.py", line 346, in loads
return _default_decoder.decode(s)
File "/usr/lib/python3.9/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python3.9/json/decoder.py", line 353, in raw_decode
obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 4 column 1 (char 25)
~/.../bak/qtrader >>>