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In order to generate a bone rig I have created the metarig and adjusted it to my model/character. As I am trying to create something simple (to use it in Unity), I removed the face and ears.

Character with the metarig

Then I re-calculated the noremal ("Shift + N" and then "Y").

Once I generated the rig (Object Data Properties > Rigify Buttons > Generate Rig) I got the following error:

Generation has thrown an exception: 'bpy_prop_collection[key]: key "ORG-nose" not found'

And in the Layers it appears a new one named "rig" and it highlights the following:

New Layer - Rig

What am I missing here?

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Found the problem.

The face bones were not all removed as I saw one inside the big bone when I moved it.

Small bone

Removing that small isolated bone solved the problem.

Problem solved

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