When you try to connect to ssh and can’t

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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 the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
41:00:9d:32:17:69:ec:05:f0:b1:5b:80:cc:1e:21:29.
Please contact your system administrator.
Add correct host key in /Users/yakko_tofu/.ssh/known_hosts to get rid of this message.
Offending key in /Users/yakko_tofu/.ssh/known_hosts:15
RSA host key for 54.250.121.171 has changed and you have requested strict checking.
Host key verification failed.

If you get an error like the above, delete the address you are no longer using in the following known_hosts and you are OK.

~/.ssh/known_hosts

＼電子工作歴9年の私のイチ押し！ELEGOOの電子工作キット／