Run-time error '424' (object required)

[jovir]

Hello

The 424 error occurs when an object is necessary.
I’m having trouble to reference an instruction to a property of an object.
The object in question was created in a form and the instruction that needs it belongs to a class of functions.
I tried starting and restarting and create a new object in the function, but I got the error 91 (Object variable or with block variable not set).

Question: How do I refer the instruction to the object property already created?
Data:
The instruction belongs to Excel.Application.

I’m using VB6.

this snippet of code belongs to the form:
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Dim xl As Excel.Application
Dim xlw As Excel.Workbook
Set xl = CreateObject("Excel.Application")
Set xlw = xl.Workbooks.Open(ARQUIVO_DE_REFERENCIA)
xl.Visible = True

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this snippet of code function:
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Sheets("PlanB").Select
line= ActiveCell.Row
column = ActiveCell.Column
Sheets("PlanA").Select
Range("A1:I48").Select
xl.Selection.Copy
Sheets("PlanB").Select
Range("A" & Line+ 3).Select
ActiveSheet.Paste
Range(column & ":" & Line + 5).Select

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the instruction Selection.Copy that referenced to the object xl