boost::asio write_some - error

I have some problem with send data by boost::asio. My code:

 void Connection::SendCommand(std::shared_ptr<ICommand> command)
        {
                int dataSize = command->GetSize();
                  
                vector<char> dataBuffer = vector<char>(dataSize);
                  
                stringstream ss;
                binary_oarchive oa(ss);
                command->Serialize(oa);
                  
                if(_side == Server)
                        command->Execute();
                  
                binary_iarchive ia(ss);

                ia.load_binary(&dataBuffer[0], dataSize);

                int* header = new int[3];

                header[0] = (int)(command->Type());
                header[1] = (int)FromClientToServer;
                header[2] = dataSize;

                size_t s = _socket->write_some(buffer(header, 3*sizeof(int)));
                size_t s1 = _socket->write_some(buffer(dataBuffer, dataSize*sizeof(char)));
                  
                delete[] header;
        }

I get exception on the second call write_some:

boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> > at memory location 0x0021F520.

Does anybody know what is wrong?