Problemas com Exemplo Revista 66 Clube Delphi

Server Error in ´/Cap´ Application.
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Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 229:end;
Line 230:
[b:945ba563be]Line 231:procedure TWebForm1.ExecutarCommand(Com : fbCommand);[/b:945ba563be]
Line 232:begin
Line 233: Com.Connection.Open();

já revisei totalmente o código está o clone do artigo do Guinther....

Eu não sei o que possa ser...

Alguem me ajude

Carlos Henrique Lemos