Some sites seem to forget a part that it’s important to play RPG Maker games, which is the RTP (Run Time Package). Most RPG Maker games use one version or another of it, especially ones from 2000/2003 (which are the ones being supported by EasyRPG.
This is a file structure sometimes shared among here, might help as a guide.
https://f4ke.de/dev/easyrpg/wii_folder_structure.html
If it still fails to run even with the RTP files in place, check if you got a meta.xml, boot.dol and icon.png files inside your game folder as the file structure above suggests, I’ve no Wii so I can’t help you with that but this link seems to point that out.
Hope it works! Have a nice one.