K4 Kindle 4 KUAL Issue

Hi everyone

My first post!

I've been given a Kindle 4, 2011 (silver paddle edition), running firmware 4.1.3.

I've factory reset the device, and ran jailbreak kindle-k4-jailbreak-1.8.N-r16252. That went through no issues at all, and I see the book.

On the below, I have read the instructions, ensuring files are to my specific device

Installed kindle-mkk-20141129-r16572. That seemed to install without any issues - I didn't see any errors.

Installed KUAL-v2.7.21-g3928582-20190724.

I see the KUAL book in my library, I run it, and get:

An error occured:Main class instantiation threw a RuntimeException. Please contact the developer.


Reading this can happen on the first run, I waited 30 secs and run again, got the same message. I've checked the folder structure of the kit, and don't see the extensions folder from what I've read.

I re-run kindle-mkk-20141129-r16572 just to make sure, didn't do much though.

At the moment, I've done another factory reset and left the kit as it is as wasn't too sure what else to try

Hope someone can help!