Uh, I got these differing results instead(see below), though I'm not sure what error it refers to...
The document is a little confusing if you read through it quick (I came up with 0x4C the first time as well), but if you read through it again you'll realize the green and red LED arrays each individually define a nibble(4 bits) of the code, versus each tri-color LED representing a pair of bits in the code.

Code:
Upper Nibble (Red LED array): 0010 => 0x2
Lower Nibble (Green LED array): 1010 => 0xA

=> 0x2A Post Code