Error in compiling project

[murliswami]

In file included from ...\Arduino\libraries\sim800\sim800Client.h:6:0,

             from ...\Arduino\libraries\sim800\sim800.cpp:21:

...\Arduino\libraries\sim800\sim800.h:14:24: error: 'Serial1' was not declared in this scope

#define HARDWARESERIAL Serial1

                    ^

...\Arduino\libraries\sim800\sim800.cpp:27:28: note: in expansion of macro 'HARDWARESERIAL'

HardwareSerial *modem = &HARDWARESERIAL;

                        ^

exit status 1
Error compiling for board Arduino Nano.

PS: i am beginner in Ardunio plz suggest me

[Gabriellavoura]

Try to add HardwareSerial.h on your sketch.

#include "HardwareSerial.h

See this Topic for more info.