build error
```
oCore::get_tx_amount_output_indices(uint64_t) const':
/root/openmonero/src/xmregcore/src/MicroCore.cpp:193:42: error: could not convert 'cryptonote::BlockchainDB::get_tx_amount_output_indices(tx_id, 1)' from 'vector<std::vector<long unsigned int, std::allocator<long unsigned int> >,allocator<std::vector<long unsigned int, std::allocator<long unsigned int> >>>' to 'vector<long unsigned int,allocator<long unsigned int>>'
     return core_storage.get_db()
            ~~~~~~~~~~~~~~~~~~~~~          
             .get_tx_amount_output_indices(tx_id);
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
```