i am creating the dll for creatring the text files on the server. i want to fetch the values form the session variables and from the form and wnat to craete the text file i am using this function id DLL
Public Function UserDocument(computercode, coursenumber, courserole1, coursename, name, strphysicalpath, value, testdate, testtime, syallbus, testval, venue, remarks) As Variant

Dim number
'number = 1000
Dim fso As Variant
Dim objFile As Variant
Dim filename As String
filename = strphysicalpath & "\" & value & ".htm"

Set fso = CreateObject("Scripting.FileSystemObject")
Set objFile = fso.CreateTextFile(filename)
objFile.WriteLine ("Created at: " & Now)


objFile.WriteLine "<p align='right'>" & Month(Date) & "/" & Day(Date) & "/" & Year(Date) & "</p>"

objFile.WriteLine "<p align='center' ><font face='arial' size='3' color='black' align='center'><b>"

objFile.WriteLine "<u>" & "Notice for" & "&nbsp; " & value & "</u></b></p></font>"
objFile.WriteLine "<br>"
objFile.WriteLine "<br>"
objFile.WriteLine "<table border='0' align='center' cellpadding=0 width='90%' bordercolor='black' cellspacing='0' height='90%'>"

objFile.WriteLine "<tr><td width='44%' height='21' align='center' >"

objFile.WriteLine "<b ><font face='arial' size='2' align='center'> " & " Computer Code " & " </b>" & "</td><td width='44%' height='21' align='left' nowrap> " & computercode & "</font> " & "<br>"
objFile.WriteLine "</td></tr>"
objFile.WriteLine "<tr><td width='44%' height='21' nowrap align='center'>"

objFile.WriteLine "<b><font face='arial' size='2' align='center'>" & "Course Name: " & " </b>" & "</td><td width='44%' height='21' align='left' nowrap> " & "" & "</font> " & "<br>"
objFile.WriteLine "</td></tr>"
objFile.WriteLine "<tr><td width='44%' height='21' align='center' nowrap>"

objFile.WriteLine "<b><font face='arial' size='2' align='center'>" & "Test Date: " & " </b>" & "</td><td width='44%' height='21' align='left'nowrap>" & "" & testdate & "</font>" & "<br>"
objFile.WriteLine "</td></tr>"
objFile.WriteLine "<tr><td width='44%' height='21' nowrap align='center'>"

objFile.WriteLine "<b><font face='arial' size='2' align='center'>" & "Test Time: " & " </b>" & "</td><td width='44%' height='21' align='left' nowrap>" & "" & testtime & "</font>" & "<br>"
objFile.WriteLine "</td></tr>"
objFile.WriteLine "<tr><td width='44%' height='21' align='center' nowrap>"


objFile.WriteLine "<b><font face='arial' size='2' align='center'>" & "Syllabus" & "<B>" & "</td><td width='44%' height='21' align='left' nowrap>" & "" & syallbus & "</font>" & "<br>"
objFile.WriteLine "</td></tr>"
objFile.WriteLine "<tr><td width='44%' height='21' align='center' nowrap>"

objFile.WriteLine "<b><font face='arial' size='2' align='center'>" & "Venue: " & " </b>" & "</td><td width='44%' height='21' align='left' nowrap>" & "" & venue & "</font>" & "<br>"
objFile.WriteLine "</td></tr>"
objFile.WriteLine "<tr><td width='44%' height='21' align='center' nowrap>"

objFile.WriteLine "<b><font face='arial' size='2' align='center'>" & "Remarks :" & "</b>" & "</td><td width='44%' height='21' align='left' nowrap>" & " <font align='center'>" & "" & remarks & "</font>" & "<br>"
objFile.WriteLine "</td></tr>"
objFile.WriteLine "</table>"
objFile.WriteLine

Set objFile = Nothing
Set fso = Nothing
End Function
but when i use this function in asp as
<%set objtest=server.CreateObject("clst.clsclst")
objtest.UserDocument(computercode)
set objtest=nothing%>
is is showing this error

Microsoft VBScript runtime error '800a01c1'

Argument not optional: 'UserDocument'

what could vbe the reasona nd how will i fetch the values from the form and the session values to make the teaxt file using dll