stm32f103 No source available for "pulStack() "

void dma_read_init_file(void){

  u8 tmp0 ;

  u8 tmp1 ;

  u8 info_status[5]={9,9,9,9,9};

   fat_res=f_open(&File[0], "info_mp3.txt", FA_OPEN_EXISTING | FA_READ);

  fat_res = f_read(&File[0], info_status, 40, &fat_bitct);

  f_close(&File[0]);

  if (fat_res== FR_OK) {

    memcpy(&sel_dir,info_status,1);

    memcpy(&tmp0,info_status+1,1);

    memcpy(&tmp1,info_status+2,1);

  }

  sel_file=tmp0<<8;

  sel_file|=tmp1;

  return;

}