Getting warning "Failed to create agent because there is no valid Navmesh" using Unity

Question

I'm using procedural mesh geometry and I've set Navigation Static 'On' in the Navigation Window. I've also set the mesh generator to 'Static' in the inspector. I also baked my enemy's agent, but it is still throwing the warning "Failed to create agent because there is no valid NavAgent" that is most likely causing the error: "SetDestination" can only be called on an active agent that has been placed on a NavMesh. That error is happening every frame. What can I do to create a better NavMesh?

Links:

Procedural Mesh Geometry

https://docs.unity3d.com/Manual/GeneratingMeshGeometryProcedurally.html

Nav Mesh

https://docs.unity3d.com/Manual/nav-NavigationSystem.html