In the next few steps, we will run you through the main causes of the problem and help you to fix it as we go along. 1. Make sure you have installed the correct version of the mod. This is the most common cause of the problem. If you have recently added the mod, this is an easy trap to fall into., How to Fix Minecraft Mods Not Downloading? There can be a number of reasons why your Minecraft mods aren’t downloading. Here are the things you need to check first: Check whether your Internet connection is stable. See if your game is up to date. See if the mod is up to date., Exit Code 1 is an unhelpful error basically meaning the game crashed before it could even set up something to tell you why it crashed. It's most commonly an issue with your Java setup (like using Java 8 in a version that needs Java 17), but since you said you could get 1.20.1 Forge to load with 0-3 mods I doubt that is the issue., Minecraft itself is coded in Java, and so are mods and mod loaders like Forge/Fabric that depend on specific Java features for modification. An outdated Java runtime prevents successful loading of many mods properly., Before we get to the solutions, let's list the main reasons why mods may not work: Incompatibility of the mod version with the game version. Lack of necessary libraries or dependencies. Conflict with other installed mods. Errors in the configuration files of the mod. Incorrect installation of mod files., In this full guide, we’ll walk you through the step-by-step process of diagnosing and fixing Minecraft mod errors, so you can get back to building, battling, and exploring with your favorite mods. What Does “Error Loading Mods” Mean? When Minecraft displays the “Error Loading Mods” message, it means one or more mods failed to load correctly..