VBA Excel-自动填充方法超出范围类错误

由于某种原因，我有自动填充方法超出范围的类错误，我找不到原因。我的代码中有很多公式，我经常使用，每次都会停止我的代码。这是我的sub的相关部分：

'U means union, M means main
'Advanced filter for visual worksheet
UnionWB.Worksheets("Union").ShowAllData
Dim ULR As Long, ULC As Long, MLR As Long

ULR = Cells(Rows.Count, "A").End(xlUp).Row
ULC = Cells(1, Columns.Count).End(xlToLeft).Column

With MainWB.Worksheets(sheet1)
    MLR = .Cells(Rows.Count, "A").End(xlUp).Row
End With

    MainWB.Worksheets("aheet2").Columns("A:Z").Clear
    UnionWB.Worksheets("Union").Range(Cells(1, 1), Cells(ULR, ULC)).AdvancedFilter Action:=xlFilterInPlace, _
    CriteriaRange:=MainWB.Worksheets("sheet1").Range("A1", "A" & MLR), Unique:=False
    UnionWB.Worksheets("Union").Activate
    Range("A1", "Y" & ULR).Select
    Selection.Copy
    MainWB.Worksheets("sheet2").Activate
    Range("A1").PasteSpecial xlPasteValues
    Range("AB2").Select
    Selection.AutoFill Destination:=Range("AB2", "AB" & MLR)


If MLR > 2 Then
    With MainWB.Worksheets("sheet1).Range("N2")
        ActiveCell.FormulaR1C1 = _
        "=IF(ISNUMBER(SEARCH(""sheet2"",RC[-9])),""yes"",""no"")"
        Selection.AutoFill Destination:=Range("N2", "N" & MLR)
    End With
End If 

Selection.AutoFill目的地：=范围（“AB2”、“AB”和MLR）

Selection.AutoFill目标：=范围（“N2”、“N”和MLR）

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更改以下两行：

Range("AB2").Select
Selection.AutoFill Destination:=Range("AB2", "AB" & MLR)

致：

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更改以下两行：

Range("AB2").Select
Selection.AutoFill Destination:=Range("AB2", "AB" & MLR)

致：