iar 堆栈设置_关于IAR7.51A中的堆栈设置问题

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我用8.20版本的IAR打开原来的工程文件，选择device为CC2530F256后，编译提示一下错误：

Error[e16]: Segment RAM_CODE_FLASH (size: 0x27 align: 0) is too long for segment definition. At least 0x4 more bytes needed. The problem occurred while processing the segment placement command "-Z(CODE)RAM_CODE_FLASH=_RAM_CODE_FLASH_START-_RAM_CODE_FLASH_END", where at the moment of placement the available memory ranges were "CODE:39edd-39eff"

Reserved ranges relevant to this placement:

CODE:39edd-39eff    RAM_CODE_FLASH

BIT:0-7             BREG

BIT:80-97           SFR_AN

BIT:a0-af            SFR_AN

BIT:b8-c7           SFR_AN

BIT:d8-df         SFR_AN

BIT:e8-ef          SFR_AN

BIT:f8-ff         SFR_AN ，

用原来的IAR7.51A编译配置文件使用cc2530.i51时是没有问题的，我试了TI的其他例程，都提示这个错误，请问这是什么原因啊？