急急急！！！遍登陆窗口时出现的问题

本人是个菜鸟，最近因毕业设计要编一个题库，在编登陆窗口是遇到以下困难，请各位高手帮忙指导一下，谢谢！
unit Unitdenglu;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls, DB, DBTables, Buttons, Mask, DBCtrls;type
  Tdenglu = class(TForm)
    Query1: TQuery;
    Edit1: TEdit;
    Edit2: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Button1: TButton;
    Button2: TButton;    
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  denglu: Tdenglu;implementationuses UnitRYGL, UnitHYSY;{$R *.dfm}
procedure Tdenglu.Button1Click(Sender: TObject);
var
  right:string;  begin   
          if   (Edit1.Text='')or(Edit2.Text='')   then
                begin
                    showmessage('用户名或口令为空');
                    exit;
                end
                else              begin
                  query1.Close;
                  query1.SQL.Clear;
                  query1.SQL.Add('select   *   from  GLYname   where   Username='+''''+Edit1.Text+''''+
                  '   and   password='+''''+Edit2.Text+'''');
                  query1.Open;
                  if   query1.RecordCount=1   then
                      begin   
                          right:=query1.fieldbyname('rright').AsString;
                          RYGL.Enabled:=true;
                          Edit1.Clear;
                          Edit2.Clear;
                          close;
                      end   
                  else   
                      begin
                       showmessage('用户名和口令有误');
                       Edit1.SetFocus;
                       
                       end;
                       end;
                       end;procedure Tdenglu.Button2Click(Sender: TObject);
begin
    denglu.Close;
    HYSY.Show;end;end.
一样是登陆窗口的源程序，表的名称是GLYname，是用paradox7建的，有两个字段，Ｕsername(A)和password（Ａ）,前一个是keyword,运行后出现以下错误提示：Ｐroject ProjectNDG.exe raised exception class EDBEngineError with message'Invalid use of keyword
Token:password='123456'
Line Number:1'.Process stopped. Use Step or Run to continue
其中１２３４５６是我输入的密码，请问各位大侠我的程序那里有问题，并给些知道，谢谢谢谢！！！