javascript - OpenTextFile gives error Automation server can't create Object -

i created method create text file log page has different buttons call functions parameters different textfields:

function writetofile(data) {     var currentdate = new date();      var datetime = "time: " + currentdate.getdate() + "/" + (currentdate.getmonth()+1)  + "/" + currentdate.getfullyear() + " @ " + currentdate.gethours() + ":" + currentdate.getminutes() + ":" + currentdate.getseconds();     var fso = new activexobject("scripting.filesystemobject");     var = fso.opentextfile("c:\\logs\\log.txt", 8);     a.writeline(datetime);     a.writeline(data + "\n");     a.close();  } 

and works fine when i'm using c: drive. unfonrtunately, used in production in z: drive other people can use page well. when copy z: drive , change line:

var = fso.opentextfile("c:\\logs\\log.txt", 8); 

to following:

var = fso.opentextfile("z:\\logs\\log.txt", 8); 

it gives me error saying:

automation server can't create object

i using ie8. ideas on i'm doing wrong , how can fix this?