一步步升级6提示成功，但运行不了，提示Python缺少库，由于本人所在服务器无法连接外网，于是跑回原来的版本4，但报错。
错误信息如下：
[root@iamca seafile-server-4.0.3]# ./seahub.sh start
Starting seahub at port 8000 …
Loading ccnet config from /home/www/seafile/ccnet
Loading seafile config from /mnt/download4/software/seafile-data
Unknown command: ‘run_gunicorn’
Type ‘manage.py help’ for usage.
Error:Seahub failed to start.
Please try to run “./seahub.sh start” again
[root@iamca seafile-server-4.0.3]# ./manage.sh help
-bash: ./manage.sh: 没有那个文件或目录