How To Fix the "Missing Required Core Mod or Plugin" Error on a Minecraft Server

When working with mods, a common error you may run into is a missing core mod or plugin. This simply means that a mod is missing a critical function or component from another mod, and the missing mod must be installed to the server in order for it to function correctly. These are also known as Dependencies!

Identifying the Issue

Whenever a missing dependency is found, most of the time Minecraft will report it through either a splash screen:


Or within a crash log:


Regardless of the screen you find it on, the solution is fairly simple!

The Solution

A missing dependency is solved simply by installing whatever mod is missing. In our examples:

Example 1 is requesting a mod defined as Saltmod. You would simply download the mod from CurseForge, Moderinth, or other reliable modding website that has the requested mod, and install it to your server or local installation!

Along the same lines, Example 2 asks for a specific version of Build Craft Core. Be vigilant of specific versions, as you'll need to install whatever version is indicated by the error message in order for the mod to work!

And finally, in Example 3, we have a similar situation to Example 1, whereas the server does not have Transliterationlib installed. Like in example 1, any version of the mod will suffice, so long as it supports the current Minecraft version the server or your client are running!