Either:
In the VBE, go to Tools|References… and tick Microsoft Scripting Runtime

2023-03-27_142848.jpg

or:
change the lines:
Dim rebars2  As Scripting.Dictionary
Set rebars2 = New Scripting.Dictionary
to:
Dim rebars2  As Object
Set rebars2 = CreateObject("Scripting.Dictionary")
and change the line:
        lb.AddItem rebars2.Items(i) & " - " & rebars2.Keys(i)
to:
        lb.AddItem rebars2.Items()(i) & " - " & rebars2.Keys()(i)