添加MsgBox后运行时错误“3001”

Question

以下代码正常工作，直到我添加一个注释，该注释会吐出我正在处理的东西的长度（第3行）。我不能为我的生活弄清楚为什么简单地添加一个消息框会崩溃整个事情。如果我向if语句添加另一个条件，也会发生同样的事情。发生什么事了？

If rs.Fields(iCols).Name = "Image1" Then
    'MsgBox rs.Fields(iCols).Value
    MsgBox Len(rs.Fields(iCols))
    'Worksheets("Checklist").Range("A117").Value = rs.Fields(iCols).Value
    Set mstream = CreateObject("ADODB.Stream")
    mstream.Type = 1         ''adTypeBinary
    mstream.Open
    mstream.Write rs.Fields(iCols).Value
    mstream.SaveToFile "C:\temp\" & "Image1" & ".jpg", 2    ''adSaveCreateOveWrite
    mstream.Close

    Dim myPict As Picture
    Dim PictureLoc As String
    PictureLoc = "C:\Temp\Image1.jpg"

    With Range("A1")
        'Set myPict = ActiveSheet.Pictures.Insert(PictureLoc)
        Set myPict = Worksheets("PI Pics").Pictures.Insert(PictureLoc)
        .RowHeight = 15
        myPict.Top = .Top
        myPict.Left = .Left
        myPict.Placement = xlMoveAndSize
        myPict.Width = 200
        myPict.Height = 200
    End With
End If