Simple Custom Functions are not getting registered

[skocherlakota]

I was looking for a working reference to implement a call to custom function and found below
#272 (comment)
But it gives me the following error "Unable to find specific method!" when i tired. Please note i'm using JUST.Net 4.3.0

Module Program
    Sub Main(args As String())
        Dim transformer As String = String.Empty
        Dim transformedString As String = String.Empty
        Dim jsStr As String = String.Empty
        jsStr = File.ReadAllText(Directory.GetCurrentDirectory() + "\input.json")
        Dim context = New JUSTContext()
        context.RegisterCustomFunction(Nothing, "JUST.UnitTests.Helper", "ReturnValue", "returnValue")
        transformer = File.ReadAllText(Directory.GetCurrentDirectory() + "\inputTransformer.json")
        transformedString = New JsonTransformer(context).Transform(transformer, jsStr)
        Console.Write(transformedString)
        Console.ReadLine()
    End Sub
End Module

Namespace JUST.UnitTests
    Public Class Helper
        Public Shared Function ReturnValue() As String
            Return "Works"
        End Function
    End Class
End Namespace

[Courela]

Is it on the same DLL as the transformer? If not, you have to pass the name of the DLL as first argument instead of null/Nothing