Pull in Variables from another BR

Update.  I've solved the problem of not being defined, but run into a new problem.  In order for the called rule to be defined, I need to specify it in the receiving rule's properties.  Done.  Now I'm getting the error in the attached image.  This is in the Connector rule which is the receiving rule.

But the code from my helper BR --which is an Extensibility rule-- validates just fine.

Namespace OneStream.BusinessRule.Extender.JDE_EnvironmentHelper
	Public Class MainClass
		Public Function Main(ByVal si As SessionInfo, ByVal globals As BRGlobals, ByVal api As Object, ByVal args As ExtenderArgs) As Object
			Try
			
               'get the Connection String - function below
				Dim connectionString As String = GetConnectionString(si, globals, api)
				Return Nothing
			Catch ex As Exception
				Throw ErrorHandler.LogWrite(si, New XFException(si, ex))
			End Try
		End Function
		
#Region "Connection String Name"		   'Create a Connection string to the External Database
	Private Function GetConnectionString(ByVal si As SessionInfo, ByVal globals As BRGlobals, ByVal api As Transformer) As String
	    Try
	 
		Dim gateWay As String = "JDE_DEV_Gateway"		'Dev connection pointing to DEV
		'Dim gateWay As String = "JDE_Proj_Gateway"        'Dev connection pointing to PROJ
		'Dim gateWay As String = "JDE_Data_Gateway"		'Prod connection pointing to PROD
		
		Dim envTbl As String = "crp"  'DEV
		'Dim envTbl As String = "proj" 'PRJ
		'Dim envTbl As String = "prod" 'PRD
		
	    Catch ex As Exception
	        Throw ErrorHandler.LogWrite(si, New XFException(si, ex))
	    End Try   
	End Function 
#End Region		
		
	End Class
End Namespace

How do I get my connector to recognize this as part of the Main class OR, what do I use in my helper instead of GetConnectionString to create my private function?  I've been struggling to figure out what else to use that would be part of Main class.  As you may have guessed by now, by VB skills are rudimentary.