ssh connection error REMOTE HOST IDENTIFICATION HAS CHANGED

The error is as follows:

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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
SHA256:34qmBqGlMXZqOIwfVs4T2YuP0yJy+qvOAkexmiQRbVk.
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:3
ECDSA host key for 192.168.0.201 has changed and you have requested strict checking.

Host key verification failed.

Solution steps:

vi /root/.ssh/known_hosts

Delete the information of the corresponding ip

It's ok to set the keyless again.