Lcd Serial-IIC-I2C y mi mega

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Muy buenas , estoy empazando con este tema y tengo el mismo problema que se describe en el post , pero no consigo solucionarlo.
Este es el error que me da al compilar vuestra solucion :

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Arduino: 1.0.5-r2 (Windows 7), Board: "Arduino Mega 2560 or Mega ADK"
LiquidCrystal_I2C\LiquidCrystal_I2C.cpp.o: In function LiquidCrystal_I2C::pulseEnable(unsigned char)': C:\Users\Dragun\Documents\Arduino\libraries\LiquidCrystal_I2C/LiquidCrystal_I2C.cpp:247: multiple definition of LiquidCrystal_I2C::pulseEnable(unsigned char)'
LiquidCrystal\LiquidCrystal_I2C.cpp.o:C:\Users\Dragun\Documents\Arduino\libraries\LiquidCrystal/LiquidCrystal_I2C.cpp:287: first defined here
c:/arduino-1.0.5/hardware/tools/avr/bin/../lib/gcc/avr/4.3.2/../../../../avr/bin/ld.exe: Disabling relaxation: it will not work with multiple definitions
LiquidCrystal_I2C\LiquidCrystal_I2C.cpp.o: In function LiquidCrystal_I2C::send(unsigned char, unsigned char)': C:\Users\Dragun\Documents\Arduino\libraries\LiquidCrystal_I2C/LiquidCrystal_I2C.cpp:229: multiple definition of LiquidCrystal_I2C::send(unsigned char, unsigned char)'
LiquidCrystal\LiquidCrystal_I2C.cpp.o:C:\Users\Dragun\Documents\Arduino\libraries\LiquidCrystal/LiquidCrystal_I2C.cpp:240: first defined here
LiquidCrystal_I2C\LiquidCrystal_I2C.cpp.o: In function LiquidCrystal_I2C::setBacklight(unsigned char)': C:\Users\Dragun\Documents\Arduino\libraries\LiquidCrystal_I2C/LiquidCrystal_I2C.cpp:278: multiple definition of LiquidCrystal_I2C::setBacklight(unsigned char)'
LiquidCrystal\LiquidCrystal_I2C.cpp.o:C:\Users\Dragun\Documents\Arduino\libraries\LiquidCrystal/LiquidCrystal_I2C.cpp:167: first defined here
LiquidCrystal_I2C\LiquidCrystal_I2C.cpp.o: In function LiquidCrystal_I2C::begin(unsigned char, unsigned char, unsigned char)': C:\Users\Dragun\Documents\Arduino\libraries\LiquidCrystal_I2C/LiquidCrystal_I2C.cpp:47: multiple definition of LiquidCrystal_I2C::begin(unsigned char, unsigned char, unsigned char)'
LiquidCrystal\LiquidCrystal_I2C.cpp.o:C:\Users\Dragun\Documents\Arduino\libraries\LiquidCrystal/LiquidCrystal_I2C.cpp:144: first defined here
LiquidCrystal_I2C\LiquidCrystal_I2C.cpp.o: In function LiquidCrystal_I2C::init()': C:\Users\Dragun\Documents\Arduino\libraries\LiquidCrystal_I2C/LiquidCrystal_I2C.cpp:36: multiple definition of LiquidCrystal_I2C::init()'
LiquidCrystal\LiquidCrystal_I2C.cpp.o:C:\Users\Dragun\Documents\Arduino\libraries\LiquidCrystal/LiquidCrystal_I2C.cpp:194: first defined here

Muchas gracias de antemano