求教，对类似的两组数据分别进行大小排序，其中一组数据报错

Dim a_px(1 To 10000) As Double
Dim a_sj(1 To 10000) As Double
'Dim b_px(1 To 10000) As Double
'Dim b_sj(1 To 10000) As Double

Dim hang As Long

Dim K() As String, Num() As Double, s As Long, l As Long, px_i As Long

sub do1(file$)
    Label2.Caption = ""
    Label3.Caption = ""
    Label4.Caption = ""

    hang = 0
    Open App.Path & file For Input As #1
    Do While Not EOF(1)
        Line Input #1, Temp
        hang = hang + 1
        a_sj(hang) = Temp
    Loop
    Close #1
   
    Call qsort(a_sj, 1, hang) '对数组使用二分法
    For px_i = 1 To hang
        a_px(px_i) = a_sj(px_i)
    Next px_i

    Label2.Caption = hang
    Label3.Caption = a_px(1)
    Label4.Caption = a_px(hang)
end sub


Private Sub Command1_Click()
    do1 "\a.txt"   
End Sub


Private Sub Command2_Click()
    do1 "\b.txt"
End Sub


'排序方法一

Sub qsort(px() As Double, ByVal kaishi As Long, ByVal jieshu As Long)
    Dim Temp As Double, J As Long, I As Long
    I = kaishi: J = jieshu '将i、j作为指针，从两侧向中部移动
    If kaishi < jieshu Then '控制是否进入循环
        Temp = px(kaishi) '将数组第一个值赋给temp，暂时充当对比量
        While I < J
            Do While I < J '指针j从右向左移动，当遇到比temp小的数时，将该值移动到指针i的位置，并使i向右移动一位
                'If px(J) <= Temp Then px(I) = px(J): I = I + 1: Exit Do
                If px(J) < Temp Then px(I) = px(J): I = I + 1: Exit Do
                J = J - 1
            Loop
            Do While I < J '指针i从左向右移动，当遇到比temp大的数时，将该值移动到指针j的位置，并使j向左移动一位
                If px(I) > Temp Then px(J) = px(I): J = J - 1: Exit Do
                I = I + 1
            Loop
        Wend
        px(I) = Temp
        Call qsort(px(), kaishi, I - 1) '递归二分法过程进行排序
        Call qsort(px(), I + 1, jieshu)
    Else
        Exit Sub
    End If
End Sub

sub do2(file$)
    Label2.Caption = ""
    Label3.Caption = ""
    Label4.Caption = ""

    hang = 0
    Open App.Path & file For Input As #1
    Do While Not EOF(1)
        Line Input #1, Temp
        hang = hang + 1
        a_sj(hang) = Temp
    Loop
    Close #1   
   
    l = hang: s = 1: ReDim Num(l)
    For px_i = s To l
        Num(px_i) = a_sj(px_i)
    Next px_i
    Call QUICK_SORT(s, l, Num)
    For px_i = s To l
        a_px(px_i) = Num(px_i)
    Next px_i   

    Label2.Caption = hang
    Label3.Caption = a_px(1)
    Label4.Caption = a_px(hang)

end sub


Private Sub Command3_Click()
    do2 "\a.txt"
End Sub

Private Sub Command4_Click()
    do2 "\b.txt"
End Sub

Private Sub Form_Load()
Label2.Caption = ""
Label3.Caption = ""
Label4.Caption = ""
End Sub


'排序方法二
Private Function PARTITION(ByVal p As Long, ByVal r As Long, ByRef a() As Double) As Long
    Dim X As Double, t As Long, I As Long, J As Long
    Randomize
    t = CLng((r - p) * Rnd + p)
    'Call Exchange(a(r), a(t))
    Dim tmp As Double
    tmp = a(r): a(r) = a(t): a(t) = tmp
    X = a(r): I = p - 1
    For J = p To r - 1
        'If a(J) <= X Then I = I + 1: Call Exchange(a(I), a(J))
        If a(J) < X Then
            I = I + 1
        else
            tmp = a(I): a(I) = a(J): a(J) = tmp
        end if
    Next J
    'Call Exchange(a(I + 1), a(r))
    tmp = a(I + 1): a(I + 1) = a(r): a(r) = tmp
    PARTITION = I + 1
End Function
Private Sub QUICK_SORT(ByVal p As Long, ByVal r As Long, ByRef a() As Double)
    If p < r Then
        Dim q As Long
        q = PARTITION(p, r, a)
        Call QUICK_SORT(p, q - 1, a)
        Call QUICK_SORT(q + 1, r, a)
    End If
End Sub