[Puppet Users] Puppet error while serving /etc/sudoers file using puppet

I am trying to update /etc/sudoers file using puppet. Here is the init.pp
function doing:

define sudoers() {
         file { "/etc/sudoers":
         owner => root,
         group => root,
         mode => 440,
         source => $operatingsystem ? {
                 "CentOS" => filelookup("users/sudoers-centos"),
                 default => filelookup("users/sudoers"),
             },
       }

While running puppet I am getting the error:

err:
/Stage[main]//Node[tcp-handler-base]/Users::Sudoers[sudoers-file]/File[/etc/sudoers]/content:
change from {md5}0897462d4d48fb9dedaafbaf91a9ceae to
{md5}3298e302080d0e63a5697dd39556ca66 failed: Could not rename temporary
file /etc/sudoers.puppettmp_8514 to /etc/sudoers: Operation not permitted -
/etc/sudoers.puppettmp_8514 or /etc/sudoers at
/etc/puppet/modules/users/manifests/init.pp:60

The persmission of /etc/sudoers file is 0440.

Can someone help in solving this.