LwIP fileserver project error

Hi,

I'm working with  EzKit Lite for BF609 processor (rev 0.0 and 0.1 )

After running the example fileserver, the console shows:

Configuring switches for the ethernet operation

lwip_system_init: failed to enable EMAC

lwip_sysboot_task: Failed to initialize system

I tried to debug, but the error is within a function "adi_ether_EnableMAC" .

Any idea to to solve the problem?

Thanks