itch.io

No, you've forgotten something important. Read this:

Types of Artificial Intelligence (AI) - GeeksforGeeks

Understand it is the same as this:

12 Types of Malware + Examples That You Should Know | CrowdStrike

Geez. Maybe I was being too idealistic. I hope you can figure something out. 

Upload it to an archive website.

Because I think this game is awesome. I don't want it to get lost.

It's because the game undergoes an integer overflow as the code in the lecture file has not yet been added to the video series. The paid file includes the full lecture. I would recommend budgeting for it first, and upon buying it to use it as a back up file in case any modifications to your file goes wrong, for example adding a new feature. Name it something like "OriginalBackupSourceBattleSystem".  I'd rather have us learning than get frustrated waiting for lecture videos. 

Try checking for stray semicolons, as one of the for loops might be "empty" if a semicolon is in the wrong place.

Something else you could try is to see the original code and your code side by side to see if you've missed anything.

This may be closer to what you might be looking for.

Changing Palette of Sprites/Backgrounds Dynamically? : r/gamemaker (reddit.com)

Retro Palette Swapper by Pixelated Pope | GameMaker: Marketplace

Can I use a sprite when drawing a global variable? : r/gamemaker (reddit.com)

Looking to create rpg battle background like earth bound : r/gamemaker (reddit.com)

For now this is the closest I could find in terms of resources. I'll keep looking, though.

Try adding it to a struct maybe? Either that, or check to see if the variables have been mentioned properly. It looks like as if the error is based on an undefined variable.

Hope that helps you.

Well I really spoke too soon… Whoops. I’m a doofus.

As far as I know, it just includes the parts that have been released for the youtube series.

Would this help for ideas on how to expand a battle system?

1. More Engaging Turn-Based Combat in RPGs (youtube.com)

2.Top 5 JRPG Battle Systems (youtube.com)

For more complex backgrounds:

1: https://www.reddit.com/r/gamemaker/comments/e9tq81/looking_to_create_rpg_battle_background_like/?rdt=53881

2:
https://forum.gamemaker.io/index.php?threads/earthbound-battle-background-sprites.99273/

For more simple backgrounds:

1: https://manual.gamemaker.io/monthly/en/GameMaker_Language/GML_Overview/Variables/Global_Variables.htm

2: https://www.youtube.com/watch?v=imIDu84jIF0

I get this error as well. It also happens to me when I defeat all the enemies. Do you get that error too?

Pherhaps one could make a global variable for the background sprite/image index and change the sprite/image index based on the presence of an enemy type?