雖然安裝opensx我得到這個錯誤

TASK: [edxapp | code sandbox | (bootstrap) load code sandbox profile] ********* 
failed: [localhost] => {"changed": true, "cmd": ["apparmor_parser", "-r", "/etc/apparmor.d/code.sandbox"], "delta": "0:00:00.003679", "end": "2014-07-06 00:13:35.972487", "item": "", "rc": 1, "start": "2014-07-06 00:13:35.968808"}                    
stderr: Warning: unable to find a suitable fs in /proc/mounts, is it mounted? 
Use --subdomainfs to override.                   

FATAL: all hosts have already failed -- aborting              

PLAY RECAP ******************************************************************** 
      to retry, use: --limit @/root/edx_sandbox.retry

這是我第一次玩edx。我不知道如何解決這個錯誤。當我去80端口的webaddress時，它要求輸入用戶名和密碼。雖然安裝opensx我得到這個錯誤

我正在使用虛擬機

來源

2014-07-06 User707