如何解决“对象'ChartObjects'的方法'添加'失败错误”

Question

我正在编写一个宏以创建一个图形，在此图形中，您将几个数据文件组合在一起，选择希望x和y值位于第一组中的列，然后根据剩余长度来循环遍历其余列第一盘。但是，我收到此错误，告诉我添加对象chartobjects的方法失败。我不明白，因为此错误仅发生在某些文件上，而不发生在其他文件上。我的代码将对某些文件有效，但对其他文件无效。

Workbooks.Add
ActiveSheet.Name = "Test Results"
'Load CSV file
Cells.Select 
Selection.Delete Shift:=xlUp
Selection.EntireColumn.Hidden = False
Selection.NumberFormat = "General"
Dim ws As Worksheet, strFile As Variant, x As Integer, y As Integer,
NumberOfFile As Integer, i As Integer, j As Integer
Dim LabelColumn As Integer, StartLine As Integer, WholeColumns As Integer,
LableColumnLetter As String, MaxColumn As String
Dim ExtraRows As Integer

'Variables
NumberOfFile = InputBox("How many files would you like to combine?")
Set ws = ActiveWorkbook.Sheets("Test Results") 'set to current worksheet   
name
strFile = Application.GetOpenFilename("Text Files (*.csv),*.csv", 
MultiSelect:=True, Title:="Please select text file...")
For i = 0 To NumberOfFile - 1

    With ws.QueryTables.Add(Connection:="TEXT;" & strFile(i + 1), 
Destination:=ws.Cells(1, 1 + WholeColumns * i))
        .PreserveFormatting = True
        .TextFileParseType = xlDelimited
        .TextFileCommaDelimiter = True
        .Refresh
    End With
Next
LR = ActiveSheet.UsedRange.Rows.Count

StartLine = InputBox("Which row do the results start in?" & Chr(10) 
& "i.e. The first row with numerical values.")
LastColumn = InputBox("What is the last column in the first set of data?" 
& Chr(10) & "Note: Please input the column letters as numbers." & Chr(10) 
& "i.e. a = 1 and c = 3.")
LastColumnL = InputBox("What is the last column in the first set of data?" 
& Chr(10) & "Note: Please input the column as a letter rather than a 
number.")
XColumn = InputBox("Which column contains your x values for your first set 
of data?" & Chr(10) & "Note: This is case sensitive please use lowercase 
letters.")
XColumn = Range(XColumn & 1).Column
YColumn = InputBox("Which column contains your y values for your first set 
of data?" & Chr(10) & "Note: This is case sensitive please use lowercase 
letters.")
YColumn = Range(YColumn & 1).Column

'Creating First Graph
Dim co As ChartObject
Dim ct As Chart
Dim sc1 As SeriesCollection
Dim ser1 As Series

'This is where the error occurs 
Set co = ActiveWorkbook.Sheets("Test Results").ChartObjects.Add(Range     
("B2").Left, Range("B2").Top, 400, 250)

co.Name = "Specimen 1"
Set ct = co.Chart
With ct
    .HasLegend = True
    .HasTitle = True
    .ChartTitle.Text = "Specimen 1"
    Set sc1 = .SeriesCollection
    Set ser1 = sc1.NewSeries
    With ser1
        .Name = "Specimen " & Counter
        .XValues = Range(Cells(StartLine, XColumn), Cells(LR, XColumn))
        .Values = Range(Cells(StartLine, YColumn), Cells(LR, YColumn))
        .ChartType = xlXYScatter
    End With
End With
ActiveSheet.ChartObjects("Specimen 1").Activate
With ActiveChart
    .Axes(xlValue, xlPrimary).HasTitle = True
    .Axes(xlCategory, xlPrimary).HasTitle = True
    .SetElement (msoElementPrimaryValueGridLinesMinorMajor)
    .SetElement (msoElementPrimaryCategoryGridLinesMinorMajor)
End With