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Error when compiling Z-Stack sample code

Other Parts Discussed in Thread: Z-STACK, CC2530, CC2520, CC2420, CC2430

Hi there,

  I just downloaded the Z-Stack sample and tried to compile it, but when I compiled it, I got a warning and an error. 

Warning[w2]: Symbol_NR_OF_BANKS is redefined in command-line

Fatal Error[e163]: The command line symbol "_EXTENDED_STACK_END" in -Z(XDATA)EXT_STACK+_EXTENDED_STACK_SIZE=_EXTENDED_STACK_START-_EXTENDED_STACK_STACK_END is not defined

Does anyone know what the messages indicate? Please help me.  By the way, I am using CC2430EM and the IAR version is 7.51A.  Thank you