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ARM9 (MCBSTR9) - NIcheLite TCP/IP stack problem

Hello,

I'm having problems with implementing the TCP/IP stack from NicheLite on a MCBSTR9 board . After I successfully write their demo program with Keil 4, the board does't respond to any request on the ethernet. NicheLite : www.iniche.com/st_lite.php

When I debug it the program enters in this section of code in the file 91x_it.c :

void Undefined_Handler(void)
{ while(1)
{ /* infinite loop */
} }

and this handler is being called in an infinite loop. We have followed the troubleshooting tips from this link with no success www.iniche.com/arm.php , the sole difference being that our debugger/programmer device is a Keil Ulink2. We used Keil 4 IDE , not the RFlasher software.

Can anyone please help me.