Error Enabling Lucene in Orchard 1.10.2.0

Topics: Installing Orchard, Troubleshooting
Jul 4 at 6:30 AM
Hello folks, newbie question that my Google skills are failing to solve.
I have Orchard 1.10.2.0 deployed to Azure.
I'm following the instructions here to create a site search:
http://docs.orchardproject.net/en/latest/Documentation/Search-and-indexing/

I've installed Lucene but when I try to enable it I get the error:
No loader found for feature's ("Lucene") exension!

Any ideas what I'm doing wrong?