What is the Bug in the below code? [closed]

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I have written

        sub main ()
        'some code goes here
        end sub

This is the Module that I defined in the sheet1.And Yes I have only one workbook opened and in the userform1 I have given a command button Ok and when ok is pressed , The main function in sheet1 should be called

 sub CommandButton1_Click()
    call sheet1.main
 end sub

I have tried these The problem Iam facing is , The code works sometimes and sometimes throws an error saying that an undefined object or not set with Occured.Why the code is working for sometimes and not for sometimes? Do i need to make any changes to make it work everytime ? Thank you in advance

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The one thing I've found that makes my VBA programming easier is to always fully specify the object you're trying to manipulate (well, except maybe the top-level Application).

That means you should use something like Workbooks(0).Worksheets("Sheet1").main instead of relying on the active workbook.