Django Error when i run python manage.py runserver

[proszx]

Unhandled exception in thread started by <function check_errors..wrapper at 0x7f35be747ae8> Traceback (most recent call last): File "/root/anaconda3/lib/python3.6/site-packages/django/utils/autoreload.py", line 226, in wrapper fn(args, **kwargs) File "/root/anaconda3/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 113, in inner_run autoreload.raise_last_exception() File "/root/anaconda3/lib/python3.6/site-packages/django/utils/autoreload.py", line 249, in raise_last_exception six.reraise(_exception) File "/root/anaconda3/lib/python3.6/site-packages/django/utils/six.py", line 685, in reraise raise value.with_traceback(tb) File "/root/anaconda3/lib/python3.6/site-packages/django/utils/autoreload.py", line 226, in wrapper fn(*args, **kwargs) File "/root/anaconda3/lib/python3.6/site-packages/django/init.py", line 27, in setup apps.populate(settings.INSTALLED_APPS) File "/root/anaconda3/lib/python3.6/site-packages/django/apps/registry.py", line 115, in populate app_config.ready() File "/root/anaconda3/lib/python3.6/site-packages/channels/apps.py", line 22, in ready monkeypatch_django() File "/root/anaconda3/lib/python3.6/site-packages/channels/hacks.py", line 10, in monkeypatch_django from .management.commands.runserver import Command as RunserverCommand File "/root/anaconda3/lib/python3.6/site-packages/channels/management/commands/runserver.py", line 5, in from daphne.server import Server, build_endpoint_description_strings ImportError: cannot import name 'build_endpoint_description_strings'

[proszx]

when I set a single Django project ,it's has no error