Type Mismatch in passing Cells(3,4) as a Range argument

Question

I'm writing a small class in Excel VBA with a sub that takes Range as an argument. But when I try to call it using Cells I get type mismatch error. (Calling using Range works fine)

Code excerpt:

Dim Com, Gua As Worksheet
Set Com = Worksheets(cCom)
Set Gua = Worksheets(cGua)

Dim myFirm As clsFirm
Set myFirm = New clsFirm
Call myFirm.Init(Gua.Cells(3, 4))  '<--ERROR HERE
Call myFirm.Init(Gua.Range("E3"))  ' this line works

And here is the sub:

Public Sub Init(nameCell As Range)
    pAddress = nameCell.Address
    pName = nameCell.Value2
    pContract = nameCell.Offset(0, -3).Value2
    pAmount = nameCell.Offset(0, 2).Value2
    pRate = nameCell.Offset(0, 1).Value2
    pStartDate = CDate(nameCell.Offset(0, -2).Value2)
    pEndDate = CDate(nameCell.Offset(0, -1).Value2)
End Sub