HVad er forkert her?

Håber der er en der kan se hvad der er galt:

<% Response.Buffer = True %>
<%
' Databaseforbindelse - husk at angive sti til din database
Set Conn = Server.CreateObject("ADODB.Connection")
DSN = "DRIVER={Microsoft Access Driver (*.mdb)}; "
DSN = DSN & "DBQ=" & Server.MapPath("opgave.mdb")
Conn.Open DSN

strSQL = "Update tblOpgave set "
strSQL = strSQL & "Ansvarlig= '" & Request.Form("ansvarlig") & "',"
strSQL = strSQL & "Forfaldsdato= '" & Request.Form("forfaldsdato") & "'"
strSQL = strSQL & " Where ID =  '" & Request.Form("opgaveid") & "'"

Conn.Execute(strSQL)
Conn.Close
Set Conn = Nothing
%>

<html>
<head>
<title>ret</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="Refresh" content="0; URL=administrator.asp">
</head>
<body>
</body>
</html>

Fejlmeddelelsen ser således ud:
Error Type:
Microsoft OLE DB Provider for ODBC Drivers (0x80040E07)
[Microsoft][ODBC Microsoft Access Driver] Data type mismatch in criteria expression.
/ret.asp, line 12