Getting error on max invalid genesis file: hex string has odd length

[benzntech]

The same problem happened to me with geth 1.6, with a genesis file similar to yours.

Last friday geth updated to 1.6 (https://github.com/ethereum/go-ethereum/releases/tag/v1.6.0).

In this release:

Genesis block JSON handling is stricter and safer. Notably, most JSON fields now require the "0x" prefix. (#3794)

I found this documentation page: https://github.com/ethereum/go-ethereum/wiki/Private-network

In this page there is an example of a genesis file that works on geth 1.6.

I think your genesis file works with previous versions.