I decided to start modding, however, I've found that when I try to create a mod, this error happens in-game

Why is this happening?

That is caused by the "dirty" GMSTs, and they need to be cleaned-out.

Info here: http://www.mwmythicmods.com/argent/tech/gmst.html

Thanks, lucky I have TESTool, so I will clean it out.

ATM, I can:

• Create an NPC, give them items and ownership


• Give NPC's diologue


• Create new cells, and assign them a region


• Create new items


• Use the render window


• Etc.....

What I aim to do:

• Learn how to make quests


• Learn how to terraform


• Learn how to make diologues hyperlink to each other


• Learn how to script


• Learn how to make an exterior load an interior


• Make Ashpit (Malacath's Realm)


• Learn how to use functions and variables correctly


• Etc.....

Basicly, I still have A LOT to learn

Thanks!

One easy way to clean these evil GMSTs and other dirty edits is to use TES3cmd. It's a command line program but you can create a batch file to just drag and drop your mod onto it to clean it. First you need to download and install TES3cmd in your data files directory, then create a batch file. Instructions and download links are at the http://www.fliggerty.com/phpBB3/viewtopic.php?f=9&t=5734.

EDIT: The darkelfguys video http://www.gamesas.com/topic/1514749-lets-mod-morrowind-a-new-tutorial-video-series/ may be helpful in learning some of what's on your to do list.

Also, avoid looking at [Gameplay]->[Settings]. When you do, all those settings (GMSTs) get added to your esp file, whether you change anything or not.