./seahub.sh start

LC_ALL is not set in ENV, set to en_US.UTF-8
Starting seahub at port 8000 ...
Traceback (most recent call last):
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/bin/gunicorn", line 8, in <module>
    sys.exit(run())
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/gunicorn/app/wsgiapp.py", line 58, in run
    WSGIApplication("%(prog)s [OPTIONS] [APP_MODULE]").run()
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/gunicorn/app/base.py", line 228, in run
    super().run()
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/gunicorn/app/base.py", line 72, in run
    Arbiter(self).run()
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/gunicorn/arbiter.py", line 58, in __init__
    self.setup(app)
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/gunicorn/arbiter.py", line 118, in setup
    self.app.wsgi()
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/gunicorn/app/base.py", line 67, in wsgi
    self.callable = self.load()
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/gunicorn/app/wsgiapp.py", line 49, in load
    return self.load_wsgiapp()
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/gunicorn/app/wsgiapp.py", line 39, in load_wsgiapp
    return util.import_app(self.app_uri)
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/gunicorn/util.py", line 358, in import_app
    mod = importlib.import_module(module)
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/seafile/seafile-server-7.1.3/seahub/seahub/wsgi.py", line 25, in <module>
    application = get_wsgi_application()
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/django/core/wsgi.py", line 13, in get_wsgi_application
    django.setup(set_prefix=False)
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/django/__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/django/apps/registry.py", line 85, in populate
    app_config = AppConfig.create(entry)
  File "/home/seafile/seafile-server-7.1.3/seahub/thirdpart/django/apps/config.py", line 94, in create
    module = import_module(entry)
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 973, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'captcha'
Error:Seahub failed to start.
Please try to run "./seahub.sh start" again