Install redashV8 on centos7

Hi,I install redashV8.0 on centos7.2.
when using command bin/run ./manage.py database create_tables,throws error
Traceback (most recent call last):
File “/opt/redash/redash-8.0.0/manage.py”, line 6, in
from redash.cli import manager
ImportError: No module named redash.cli

can anyone tell me why?