Use Custom Class in another Custom Class

I am using VB.net with ASP.net 2.0 and am not using Visual Studio. I use my text editor. I have written a class and wrapped it in a namespace called "MyBulb_NS". I want to import and use that namespace in another namespace that i've written called "MyLamp_NS". I have pasted a code snippet below to show how i import the namespace. MyBulb_NS has been compiled to a dll without errors. When I attempt to compile MyLamp_NS it fails. I have pasted its makefile and error below

I am frustrated that it is so difficult to use a custom class in a different custom class. What needs to be done to get this to work? Please help! TIA!



'Code snipped from MyLamp.vb

Option Explicit
'Option Strict

Imports System
Imports System.Data
Imports System.Data.OleDB
Imports MyBulb_NS

Namespace MyLamp_NS

Public Class MyLamp
...
private bulb a ...