Why doesn't Application.Index write array column to worksheet range?

I am trying to use Application.Index to write a specific column of a 2D array to a worksheet.

See extract of code below. Everything runs fine until it reaches the .Cells line and then it goes to the error handler. Why?

    With ThisWorkbook
        On Error Resume Next
        .Unprotect pwdWorkbook
        With .Worksheets(sht_CalcBonus)
            .Activate
            .Unprotect pwdGeneric
        On Error GoTo FunctionFailed
            .Cells(6, 2).Resize(UBound(varEmployeeArray, 1), 1) = Application.Index(varEmployeeArray, , 2)
        End With
    End With