ADODB.Recordset (0x800A0BB9) 错误

<%
      dim  sql,student_id,student_name,age,sex,in_time,homeplace,major
      student_id=Trim(Request.Form("student_id"))
      student_name=Trim(Request.Form("student_name"))
      sex=Trim(Request.Form("sex"))
      age=Trim(Request.Form("age"))
      in_time=Trim(Request.Form("in_time"))
      homeplace=Trim(Request.Form("homeplace"))
      major=Trim(Request.Form("major"))
      set urs=Server.CreateObject("ADODB.Recordset")
      sql="select student_id,student_name,sex,age,in_time,homeplace,major from student where student_name='"&student_name&"'"
      urs.open sql,conn,1,3
      if not rs.eof  then
             response.Write"<script> alert('此学生已存在.')</script>;history.back();"
             response.End
     else
            set rs="nothing"
            set rs=Server.CreateObject("ADODB.Recordset")
            sql="Selcet student_id,student_name,sex,age,in_time,homeplace,major  from student"
            urs.open sql,conn,1,3// 第 12 行
            urs.addnew
            urs("student_id")=student_id
            urs("student_name")=student_name
            urs("sex")=sex
            urs("in_time")=in_time
            urs("homeplace")=homeplace
            urs("major")=major
            urs.update
            urs.close
            set urs=nothing
     end if
 
  set urs=nothing
  response.Write "<script language=javascript>{window.alert('记录添加成功!请点击“确定”');window.location.href='add_student.asp';}</script>"                        
%>
ADODB.Recordset (0x800A0BB9)
参数类型不正确，或不在可以接受的范围之内，或与其他参数冲突。
/biyesheji/admin/save.asp, 第 12 行