How to Fix Missing Mods (MissingModsException)

Some Forge mods are dependent on additional mods to run. This is because sometimes a mod requires a certain library, or is built as an addon to an existing mod rather than as a standalone mod.

If an additional mod is required by any mods you have installed, it will be classed as a "Missing Mod" because it is not installed on your server. When there is a missing mod, your server typically won't start or will continue to crash until you have installed the required mod.

When servers crash due to this error, generally a crash report will be produced. In the crash report, you will see "Missing Mods:", followed by a list of mods and their versions. Once you've located the missing mod, you can generally just Google it to find a download.

Once you have uploaded the new required mods to the mods folder, restart your server and connect!

#Missing Mods: Forge

In some instances, the crash report will show a MissingModsException but indicate Forge as missing.

Forge isn't a mod but a server type. This error indicates that you have a version of Forge that is not compatible with the mod(s) installed on your server. This either means that you need an older or newer version of Forge.

You will want to look at line 6 and below of your crash report; it'll tell you which Forge version your server needs.

You can either change your Forge version by editing your Server Type or by downloading the specific version required from https://files.minecraftforge.net.

If downloading Forge manually, you can then follow our tutorial on How to Install Forge on your Minecraft Server.