CustomChars:22: error: 'LiquidCrystal_I2C' does not name a type
The compiler is unable to find the library, make sure it is in a "libraries" folder in the Arduino Sketch folder under your MyDocuments. I don't know about a MAC, I assume it is similar.
@DaveInOhio
What errors if any are you getting, its most likely a simple fix of Wprogram.h to Arduino.h type of deal.
Check the LiquidCrystal.h file and see if it says WProgram.h, if it does change it to Arduino.h and save it. You may need to restart the Arduino software.