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Error[e46]: Undefined external "debug_str::?relay" referred in hal_lcd

Error[e46]: Undefined external "debug_str::?relay" referred in hal_lcd ( E:\allzstack\ZStack-CC2530-2.5.1a\Projects\zstack\Samples\SampleApp\CC2530DB\

CoordinatorEB\Obj\hal_lcd.r51 )

突然报错了