Coffe mashine is blocked

Question

I lost the user manual. Where can I download one?Saeco Royal professional expresso Caffee machineThe Machine has not been used on the last three months. When I turned it on for the first time it would display "Ventilate" I fix it by decaling it. Now I turn on the machine displays "coffee dispenser blocked'. What are the steps to clear this problem?Thank you in advance.