I could not understand this error please help me

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'group,time,lecturer)values('dzzzzzzc','876',null)' at line 1

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@page import="java.sql.*" %>

<%
    if(request.getParameter("submit")!=null)
    {
        String gr = request.getParameter("grp");
        String tym = request.getParameter("time");
        String lec = request.getParameter("lecturer");
        
        Connection con;
        PreparedStatement pst;
        ResultSet rs;
        
        Class.forName("com.mysql.jdbc.Driver");
        con = DriverManager.getConnection("jdbc:mysql://localhost/englishacademy","root","");
        pst=con.prepareStatement("insert into schedule(group,time,lecturer)values(?,?,?)");
        pst.setString(1, gr);
        pst.setString(2, tym);
        pst.setString(3, lec);
        pst.executeUpdate();
        
%>
        
<script>
    alert("Record Added To The Database");
</script>
<%
    }
%>