message: [sync]best peer.
diff: @@ -490,7 +490,8 @@ where
  return Err(format_err!("{:?}", "block header is none."));
  }
  } else {
  - return Err(format_err!("{:?}", "best peer is none."));
  + //return Err(format_err!("{:?}", "best peer is none."));
  + debug!("{:?}", "best peer is none.");
  }
  Ok(())
  