Undefined property: Api::$format

Undefined property: Api::$format - Printable Version

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Undefined property: Api::$format - iridion2015 - 10-22-2016

I downloaded CodeIgnier 3.1
and incorporated the updated API version of ivancholakov.

Now I'm getting error message below,

Code:
A PHP Error was encountered

Severity: Notice

Message: Undefined property: Api::$format

Filename: libraries/REST_Controller_54.php

Line Number: 763

So what's causing the error?
How to fix this?

Thanks in advance.