The “solution” to this is to search the forum and/or ask a question. A new modder can become very frustrated just trying to create something as 'simple' as a new civilization and leader if they are not aware of all the little things that have to be just right. This is due to the addition of two expansion packs, as well as various Steam updates and game patches, all of which have changed the way mods have to be created in order to work properly. Several things have changed since the time Kael wrote his original modder’s guide. Some of the problems encountered are due to the fact that Kael’s mod is out of date and doesn’t cover everything. It is the author’s intent to help other newbie modders who are struggling to mod Civilization 5. Much of what is covered within this guide is information provided by those same modders in response to questions in the main Civ5 - C&C forum. This guide is not intended for expert modders.
Most of the information he presents is still relevant. I highly recommend that all modders start with his guide as it contains a lot of useful information and insight that I do not intend to rehash in this guide. This document is not intended to replace the fine work done by Kael in his original modder’s guide. The intent of this guide is to be an addendum to Kael’s original guide for creating Civilization 5 mods.