VBA.查找并添加值

我试图在 Excel 工作表的列中查找特定值，然后在右侧三列中添加一个值 (=1)。

My code:

Sub AddNote()
    ActiveSheet.Range("F:F").Find(What:="Cat").Select
    Selection.Offset(0, 4).Value = 1
End Sub

只有我得到：

错误消息 91：`未设置对象变量或 With 块变量。

我的命令有什么问题吗？

看看这个 ：

Sub test_IngaB()
Dim FirstAddress As String, cF As Range, LookForString As String
LookForString = "Cat"

With ThisWorkBook.Sheets("Sheet's name").Range("F:F")
    .Cells(1,1).Activate
    'First, define properly the Find method
    Set cF = .Find(What:=LookForString, _
                After:=ActiveCell, _
                LookIn:=xlFormulas, _
                LookAt:=xlPart, _
                SearchOrder:=xlByColumns, _
                SearchDirection:=xlNext, _
                MatchCase:=False, _
                SearchFormat:=False)

    'If there is a result, keep looking with FindNext method
    If Not cF Is Nothing Then
        FirstAddress = cF.Address
        Do
            cF.Offset(0, 3).Value = 1
            Set cF = .FindNext(cF)
        'Look until you find again the first result
        Loop While Not cF Is Nothing And cF.Address <> FirstAddress
    End If
End With

End Sub