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6747 NDK2.0

I am using  EVM6747 , NDK version 2.0.0 and helloworld.pjt example

I found this problem:

TCP/IP Stack 'Hello World!' Application
 
Using MAC Address: ff-ff-ff-ff-ff-ff
EMAC OPEN Returned error 
Error: Unable to register the EMAC

I don`t know what`s problem.How do I solve it?

Thank you very much!