WARNING over SSH: REMOTE HOST IDENTIFICATION HAS CHANGED! solution of the error

If you receive the following error when connecting to your server via SSH, this means that the SSH information on the server you previously entered has changed.

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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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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 ECDSA key sent by the remote host is
SHA256:
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /root/.ssh/known_hosts:11
remove with:
ssh-keygen -f "/root/.ssh/known_hosts" -R "XXX.XXX.XXX.XXX"
ECDSA host key for 185.122.200.169 has changed and you have requested strict checking.
Host key verification failed.

To solve the error, we delete existing SSH keys using the command below.

ssh-keygen -f "/root/.ssh/known_hosts" -R "XXX.XXX.XXX.XXX"

You can then connect to your server again.