调试中出现的错误 ( 积分: 200 )

uses<br>&nbsp;&nbsp;Windows,&nbsp;Messages,&nbsp;SysUtils,&nbsp;Variants,&nbsp;Classes,&nbsp;Graphics,&nbsp;Controls,&nbsp;Forms,<br>&nbsp;&nbsp;Dialogs,&nbsp;StdCtrls,&nbsp;ExtCtrls,&nbsp;ComCtrls,&nbsp;ToolWin,&nbsp;Menus,&nbsp;ImgList,&nbsp;Buttons,<br>&nbsp;&nbsp;jpeg;<br>Build<br>&nbsp;&nbsp;[Fatal&nbsp;Error]&nbsp;WLZGL.PAS(8):&nbsp;Unit&nbsp;jpeg&nbsp;was&nbsp;compiled&nbsp;with&nbsp;a&nbsp;different&nbsp;version&nbsp;of&nbsp;Classes.TCustomMemoryStream<br>编译时出现这个错误，请给出解释和解决的办法。