socketConnection的初始化问题(在线等)!

socketconnection放在数据模板DMForm中,在应用程序主窗口的onshow事件中对socketconnection进行初始化:
   with DMForm do
   begin
    SocketConnection1.Close;
    SocketConnection1.Address := serverAddr;
    SocketConnection1.ServerName := 'VodAppServer.vodRDM';
    SocketConnection1.Connected := true;
   end;
怎么总是出现错误:Access Violation on..........这样的错误呢?