SSH连接的时候提示Host Key Verification Faild. 删掉~/.ssh/know_hosts问题依旧？

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
6e:c9:4d:a4:e3:53:ba:b9:9a:68:71:89:b2:96:e0:59.
Please contact your system administrator.
Add correct host key in /Users/yellowstone/.ssh/known_hosts to get rid of this message.
Offending RSA key in /Users/yellowstone/.ssh/known_hosts:1
RSA host key for yellowstone.com has changed and you have requested strict checking.
Host key verification failed.

应该怎么办呢？