Error while trying to use out-gridview with nslookup

Calling NSLookup in a script.  It outputs successfully to gridview but also throws the following error:

nslookup : Non-authoritative answer:

At C:\Temp\lookup.ps1:51 char:1

+ nslookup www.google.com | Out-GridView

+ ~~~~~~~~~~~~~~~~~~~~~~~

+ CategoryInfo : NotSpecified: (Non-authoritative answer::String) [], RemoteException

+ FullyQualifiedErrorId : NativeCommandError

Any ideas on why it's complaining?

Thanks!