Error when trying to share with remote server

Hi,
I’ve got error when trying to share library with remote server, both are community dockerized version 9.0.4 :

2022-05-04 11:33:21,732 [ERROR] django.request:224 log_response Internal Server Error: /api/v2.1/ocm/shares-prepare/
Traceback (most recent call last):
File "/opt/seafile/seafile-server-9.0.4/seahub/thirdpart/django/core/handlers/exception.py", line 47, in inner
response = get_response(request)
  File "/opt/seafile/seafile-server-9.0.4/seahub/thirdpart/django/core/handlers/base.py", line 181, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/opt/seafile/seafile-server-9.0.4/seahub/thirdpart/django/views/decorators/csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
  File "/opt/seafile/seafile-server-9.0.4/seahub/thirdpart/django/views/generic/base.py", line 70, in view
return self.dispatch(request, *args, **kwargs)
  File "/opt/seafile/seafile-server-9.0.4/seahub/thirdpart/rest_framework/views.py", line 505, in dispatch
response = self.handle_exception(exc)
  File "/opt/seafile/seafile-server-9.0.4/seahub/thirdpart/rest_framework/views.py", line 465, in handle_exception
self.raise_uncaught_exception(exc)
  File "/opt/seafile/seafile-server-9.0.4/seahub/thirdpart/rest_framework/views.py", line 476, in raise_uncaught_exception
raise exc
  File "/opt/seafile/seafile-server-9.0.4/seahub/thirdpart/rest_framework/views.py", line 502, in dispatch
response = handler(request, *args, **kwargs)
  File "/opt/seafile/seafile-server-9.0.4/seahub/seahub/api2/endpoints/ocm.py", line 364, in post
consumer_protocol = get_remote_protocol(to_server_url + OCM_PROTOCOL_URL)
  File "/opt/seafile/seafile-server-9.0.4/seahub/seahub/api2/endpoints/ocm.py", line 51, in get_remote_protocol
return json.loads(response.text)
  File "/usr/lib/python3.8/json/__init__.py", line 357, in loads
return _default_decoder.decode(s)
  File "/usr/lib/python3.8/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python3.8/json/decoder.py", line 355, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)