The Server key you entered does not match with the server key at this address」 - Centos

Hello, I need your help
I have 2 centOS server that installed xibo: old server and new server
I want to transfer data from old server to new server and done.
But when I action in new server. I get this problem:
「The Server key you entered does not match with the server key at this address」
What should I do?
I hope to hear from you soon.

Some one help me! Please!

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