RTOS/MSP430FR6989: problem with rtos in ccs 8.0

Part Number:MSP430FR6989

Tool/software:TI-RTOS

Hi, dear colleges

I am trying to use rtos within ccs 8.0.

After the installation, i built the stairstep example with some warnings like this "package/cfg/helloworld_pe430X.c", line 11327: warning #112-D: statement is unreachable"

after that i ignore the warnings and want to load the program on MSP430FR6989. 

then i got an error:

No source available for "swiLoad(unsigned long, unsigned long) [C:/Users\A0235175\workspace_v8\stairstepStopMode_MSP_EXP430FR6989_TI\Debug\stairstepStopMode_MSP_EXP430FR6989_TI.out] at 0x0" 

and in Console: 

AutoRun: Target not run as the symbol "main" is not defined.

i think, the debug function doesn't work.

Could you help me to figure out how can i get it run ? 

Regards 

Baoyuan