error in quartus

[Altera_Forum]

Hey guys! :) 

 when i run the code from https://www.altera.com/support/support-resources/design-examples/intellectual-property/embedded/nios-ii/exm-net-std-de.html in quartus 13.0sp1 and i got error and shown below. im using de1-soc board for my project. please help me:(   Error (12006): Node instance "eth_std_main_system_inst" instantiates undefined entity "eth_std_main_system" Error: Quartus II 64-Bit Analysis & Synthesis was unsuccessful. 1 error, 3 warnings  Error: Peak virtual memory: 593 megabytes  Error: Processing ended: Fri Apr 28 17:23:26 2017  Error: Elapsed time: 00:00:14  Error: Total CPU time (on all processors): 00:00:10 Error (293001): Quartus II Full Compilation was unsuccessful. 3 errors, 3 warnings

[Altera_Forum]

Readme says 

  --- Quote Start ---  To build the system, you will need to generate the system in SOPC Builder and compile the design in Quartus.  --- Quote End ---   You apparently skipped the first step.