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.NET Framework error in Español (Spanish):

MasterPage no se puede aplicar a esta página porque la colección de controles es de sólo lectura. Si la página contiene bloques de código, asegúrese de que se sitúan dentro de los controles de contenido (es decir, <asp:Content runat=server />)

English translation: MasterPage cannot be applied to this page because the control collection is read-only. If the page contains code blocks, make sure they are placed inside content controls (i.e. <asp:Content runat=server />)

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