dotnetzip < Access to the path bLAH is Access denied

I trying  dotnetzip on localhost everything works fine.
but on a real dotnet hosting it raises error :

Access to the path 'C:\inetpub\vhosts\blahblah.com\subdomains\rapor\httpdocs\DotNetZip-luqevaxu.tmp' is denied.


my code is just this :

using (ZipFile zip = new ZipFile(Server.MapPath("~")+"/a.zip"))
       {
           zip.AddFile(Server.MapPath("~")+"/deneme.txt");
           zip.Save();
       }


my hosting got a plesk interface.and I am afraid there is no solution to fix this on any plesk settings.
what should I do ?
any clue ?
thanks much before for any answers if may be solution or not.

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