Error with Oracle 10g auto-incremented sequence

I created a sequence in Oracle 10g because I have to increase case_number field auto_incremently. But I'm getting an error.

private void button_saveandsubmitActionPerformed(java.awt.event.ActionEvent evt) { con = JavaConnectDB.ConnectDB(); try{ String sql="insert into FIR_form values(case_number_sequence,?,?,?,?,?,?,?,?,?,?,?)"; pst = (OraclePreparedStatement) con.prepareStatement(sql); pst.setString(1,text_date.getText()); pst.setString(2,text_district.getText()); pst.setString(3,text_subject.getText()); pst.setString(4,text_description.getText()); pst.setString(5,text_cfullname.getText()); pst.setString(6,text_fhname.getText()); pst.setString(7,text_caddress.getText()); pst.setString(8,text_contact.getText()); pst.setString(9,text_suspectfullname.getText()); pst.setString(10,text_suspectaddress.getText()); pst.setString(11,text_suspectdescription.getText()); rs = (OracleResultSet) pst.executeQuery(); if(rs.next()){ JOptionPane.showMessageDialog(null, "the FIR has been added successfully!!!"); con.close(); this.dispose(); } else{ JOptionPane.showMessageDialog(null, "enter all fields appropriately first!!!"); } con.close(); }catch(Exception e){ JOptionPane.showMessageDialog(null, "An error occured. try again later !!!"); } }