Can't compile I2C example about liquidmenu HOT 8 CLOSED

/*!
 * @name Arduino's parallel "LiquidCrystal" library
 * @{
 */
// #define LIQUIDMENU_LIBRARY LiquidCrystal_LIBRARY
// #include <LiquidCrystal.h>
// #define DisplayClass LiquidCrystal
//!@}

/*!
 * @name I2C library
 * @see https://github.com/johnrickman/LiquidCrystal_I2C
 * @{
 */
#define LIQUIDMENU_LIBRARY LiquidCrystal_I2C_LIBRARY
#include <LiquidCrystal_I2C.h>
#define DisplayClass LiquidCrystal_I2C
//!@}

In file included from /Users/antwal/Documents/Arduino/libraries/LiquidMenu/src/LiquidLine.cpp:30:0:
/Users/antwal/Documents/Arduino/libraries/LiquidMenu/src/LiquidMenu.h:56:122: note: #pragma message: LiquidMenu: Selected 'LiquidCrystal_I2C' (I2C) library. Edit 'LiquidMenu_config.h' file to change it.
 # pragma message ("LiquidMenu: Selected 'LiquidCrystal_I2C' (I2C) library. Edit 'LiquidMenu_config.h' file to change it.")
                                                                                                                          ^
/var/folders/t8/b6xtsj5121q_9qcnbwcpcxwc0000gn/T//ccbVoEN0.ltrans0.ltrans.o: In function `global constructors keyed to 65535_0_sketch_jan12a.ino.cpp.o.2759':
<artificial>:(.text.startup+0x142): undefined reference to `LiquidCrystal_I2C::LiquidCrystal_I2C(unsigned char, unsigned char, unsigned char)'
/var/folders/t8/b6xtsj5121q_9qcnbwcpcxwc0000gn/T//ccbVoEN0.ltrans0.ltrans.o: In function `setup':
/Users/antwal/Documents/Arduino/sketch_jan12a/sketch_jan12a.ino:76: undefined reference to `LiquidCrystal_I2C::init()'
collect2: error: ld returned 1 exit status