I received this message, on the dashboard. You use old

I received this message, on the dashboard.

You use old version of wp-content/sunrise.php file. Please, replace that file with new version which is located by following path: wp-content/plugins/domain-mapping/sunrise.php.

I have followed the instructions and replaced the file, but it simply will not go away.

So I am puzzled as to what to do next ?

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