warning while compiling LiquidCrystal example

Compiling the next code:

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);

void setup()
{
lcd.begin(16,1);
lcd.print(“hello, world!”);
}

void loop() {}

I got the following warning:
WARNING: Category ‘’ in library UIPEthernet is not valid. Setting to ‘Uncategorized’
/Users/Theo/Documents/Arduino/libraries/LiquidCrystal/I2CIO.cpp:35:26: fatal error: …/Wire/Wire.h: No such file or directory
#include <…/Wire/Wire.h>

What is wrong?