Error:Seahub failed to start.提示 No module named 'captcha'

环境centos7,mysql安装社区版
如题,执行seahub.sh start 时遇到,启动失败
尝试debug模式,如下
./seahub.sh start-fastcgi

LC_ALL is not set in ENV, set to en_US.UTF-8
Starting seahub (fastcgi) at 127.0.0.1:8000 …
Traceback (most recent call last):
File “/root/ns_seafile/seafile-server-7.1.4/seahub/manage.py”, line 10, in
execute_from_command_line(sys.argv)
File “/root/ns_seafile/seafile-server-7.1.4/seahub/thirdpart/django/core/management/init.py”, line 364, in execute_from_command_line
utility.execute()
File “/root/ns_seafile/seafile-server-7.1.4/seahub/thirdpart/django/core/management/init.py”, line 338, in execute
django.setup()
File “/root/ns_seafile/seafile-server-7.1.4/seahub/thirdpart/django/init.py”, line 27, in setup
apps.populate(settings.INSTALLED_APPS)
File “/root/ns_seafile/seafile-server-7.1.4/seahub/thirdpart/django/apps/registry.py”, line 85, in populate
app_config = AppConfig.create(entry)
File “/root/ns_seafile/seafile-server-7.1.4/seahub/thirdpart/django/apps/config.py”, line 94, in create
module = import_module(entry)
File “/usr/lib64/python3.6/importlib/init.py”, line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File “”, line 994, in _gcd_import
File “”, line 971, in _find_and_load
File “”, line 953, in _find_and_load_unlocked
ModuleNotFoundError: No module named ‘captcha’
Error:Seahub failed to start.
然而在python的list中
是有的
captcha 0.3
django-simple-captcha 0.5.12
不知道有遇到的没,怎么解决的

看到这个帖子https://bbs.seafile.com/t/topic/11660/5
猜测可能是python环境的问题,用python3重新安装了captcha,可以开启了