Listbox add item multicolumn

I'm trying to add items to the second column of a listbox using vlookup but i keep getting a run-time error 380 "cound not set the List property. Invalid property value.

I can't figure out what is going on. the column count is set to 2 on the listbox.

       'Adds Items to column 2 of listbox
            With Me.SalesReportLB
                For j = 0 To SalesReportLB.ListCount - 1
                    x = Application.VLookup(SalesReportLB.List(j), SheetNum.Range(CatCol & "1", SheetNum.Range("C" & Rows.Count).End(xlUp)), 3, False)
                    .List(j, 1) = x
                Next j
            End With

it fails on this line

.List(j, 1) = x

any help would be great