change host name of my server and cpanel unlicensed

I have an ovh server. Some days before I just login in my WHM and I change host name server1.domain.com to ip of my server xxx.xxx.xxx.xxx. after that change I have lost access of cpanel. When I login root I got this error screen.

Thank You for installing cPanel & WHM.

In order to access the interface, you will need to make sure that the software license on this server is active and installed.

Your license could not be activated because:

Cannot Read License File...

change host name of my server and cpanel unlicensed

from Site & Server Administration http://ift.tt/1y6O1yX
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