I can read but not write to an Excel file!

Hello,
I hope someone can help me witht this. I am writing a program that reads and writes to an Excel file with the use of Jakarta's HSSF.
I can read the excel file with no problems, but when it comes to writing on it it only works the first time! Then when i try again, I get this:
java.io.FileNotFoundException: N:\Servers.xls (Access is denied)
     at java.io.FileOutputStream.open(Native Method)
     at java.io.FileOutputStream.<init>(Unknown Source)
     at java.io.FileOutputStream.<init>(Unknown Source)
On some PCs i have no problems, but on others it works only once and then I get the above error. I am using Java 1.5.0. Thanks.
Message was edited by:
nnt01

ya..evrything is fine..my program even creates that file
I was doing some searching, is it true that this is a bug in Java..because I can't understand how sometimes it works and sometimes it doesn't

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