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Seems the errors is due to the LiquidCrystal_I2C library, you can download it from https://github.com/fdebrabander/Arduino-LiquidCrys...Please use the ps2 library that is included in this instructable, and install the latest Arduino IDE tool from https://www.arduino.cc/en/main/software.Good luck and let me know if there's any quesiton! Thanks.
I have another project that would help you track the usage by weight. Check it out at http://www.thingiverse.com/thing:1935177. Thanks!
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