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While compiling it was throwing me errors saying "Serial1 was not declared in HWSerial.cpp". As a chain reaction there were several other chain reaction errors. So I looked into the HWSerial.cpp file. and I put a new line after these two line at the begining:

#include "HWSerial.h"
#ifdef MEGA 

It's just defining Serial1 and it looks like

HWSerial Serial1;

SO totally it looks something like :

#include "HWSerial.h"
#ifdef MEGA

HWSerial Serial1;

HWSerial::HWSerial()
{
     Serial1.begin(9600);

} 

and so on 
....
....
....

After that it compiled.. But I don't know if it's correct.