Can anyone help, I am getting this error. Thank you!

***Compile Error
***User Defined not type Defined

Private Sub LoadMares()
Dim mares As New Scripting.Dictionary ***(THIS IS HIGHLIGHTED)
Dim index As Long
Dim Mare As String
For index = 2 To Source.Rows.Count
Mare = Source.Cells(index, 1)
If Not mares.Exists(Mare) Then
mares.Add Mare, Mare
cmbMare.AddItem Mare
End If
Next


End Sub
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Though daily learning, I LOVE EXCEL!
Jennifer