[Resolvido] Pagina asp.net com pag seguro

quando clico em comprar dá o seguinte erro

Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

já coloquei no na page

EnableEventValidation="true"

e tb testei

EnableEventValidation="false"

mas dá o mesmo erro

se alguem souber o que acontece eu agradeço....

falow abraços