Object doesn't support this property or method (Error 438)

is it wrong ti write the code like this?

Thanks.

Dim WB As Workbook
Dim WS As Worksheet
Dim BeginRow As Integer
Dim SearchRng As Range

Set SearchRng = Range(WB.WS.Cells(BeginRow, 4), WB.WS.Cells(BeginRow, 30))