Drupal 8.0 to 8.1.8 upgradation is not working When i tried to update drupal to latest version (8.1.8) am getting  the following error
 

But in the status report page it shows as upgraded to 8.1.8





Any idea how to resolve this ??
The message is a notice not a error so updating of core just went on. So you core is now on the latest version.

You should however solve the error.