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.NET Framework error in Português (Portuguese):

Já existe um objeto com a mesma chave no ObjectStateManager. O objeto existente está no estado {0}. Um objeto só poderá ser adicionado novamente ao ObjectStateManager se estiver no estado adicionado.

English translation: An object with the same key already exists in the ObjectStateManager. The existing object is in the {0} state. An object can only be added to the ObjectStateManager again if it is in the added state.

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