I think that @Brazilino has it.
There are several libraries with the name LiquidCrystal_I2C. The libraries are not all the same and code from 1 may not run in another. Those LiquidCrystal_I2C libraries are old and most are not maintained. The newest and best library for I2C LCD with the hd44780 controller (1602, 2004) is the hd44780 library by Bill Perry. The library is available via the IDE library manager.