我在尝试编译合约时得到此错误。
指定的代码：

basic::tradeparams basic::get_defi_trade_data(asset tokens, symbol to){
  sx::registry::defibox_table defi_table( "registry.sx"_n, "registry.sx"_n.value );

  auto rowit = defi_table.find(tokens.symbol.code().raw());
  if(rowit==defi_table.end()) return {};
  name tcontract = rowit->base.get_contract();
  string pair_id;
  for(auto& p: rowit->quotes){
    if(p.first.get_symbol()==to){
      pair_id = p.second; break;
    }                                                         }                                                           if(pair_id=="") return {};

  // get reserves                                             const auto [ reserve_in, reserve_out ] = defibox::get_reserves( stoi(pair_id), tokens.symbol );
  const uint8_t fee = defibox::get_fee();