#mods

Stop your Hytale server, upload the mod's .zip or .jar file into the mods folder with Files or SFTP, then start the server and check the console.

Choose Paper for plugins, Fabric or NeoForge/Forge for mods, Vanilla Bedrock for Bedrock players and Velocity for networks. Switch any time in the Versions tab (Bedrock: Change Egg).

Back up, open the Modpacks tab, pick Modrinth or CurseForge, filter by Loader and Version, then Details → Install. Players install the same pack and version in their launcher.

Install Fabric, Forge or NeoForge in the Versions tab, then use Mods → Browse Mods (Modrinth or CurseForge) → Install, or upload .jar files to the mods folder. Players need the same mods.

Install Simple Voice Chat, add an extra port in the Network tab, and set that port in voicechat-server.properties. Every player also needs the mod on their game.

The server crashed while updating the world. The crash report names the cause, often one broken entity or block entity at specific coordinates. Remove it carefully, with a backup first.

These errors mean the player's mods don't match the server's. Install the exact same modpack, mod versions and loader version on both sides.