I received this error while trying to run the program: Error: Top-level design entity "PAUL" is undefined I am using QUARTUS II Version6.1 How can I fix this?

Hi,

From image i can see that your top-level design name is PAUL but your entity name is ANDGATE.

We need to have entity name and name for top-level design same. change you entity name to PAUL instead of andgate.

Example : file name top.vhd set as top level entity.

entity TOP is 
  port ( ... );
end TOP;   
 
architecture my_design of TOP is 
begin 
... 
end my_design;
 

Let me know if this has helped resolve the issue you are facing or if you need any further assistance.

Best Regards,

Anand