Invalid procedure call or argument when using 2 excel sheet

[Uma]

Hi,
I am using 2 excel sheet.My script is perfectly fine with the first excel.
It is opening 2nd excel file and excuting all the rows and it is going again to the for loop and it is giving
"Invalid Procedure call or argument error"

In my case

Code:

if i-b1
Set xlWrkbk = xlApp.Workbooks.Open("C:\zip1.xls")
else if
Set xlWrkbk = xlApp.Workbooks.Open("C:\zip1.xls")
end if

I am using the same object and sheets for both excel.Is it ok?

Any help?
Thank You
Uma