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NolimitHost

Remove Client-Only Mods from a Server

Last updated: August 14, 2026

Identify a Minecraft Java server crash caused by a client-only mod and remove the incompatible file safely. A client-only mod uses rendering, menus, input, or other code that is unavailable on a dedicated server. If one is uploaded to /mods, the server may stop during startup.

Identify the Incompatible Mod

  1. Start the server once — Log in to the NolimitHost Game Panel at https://panel.nolimithost.cc/, select your Minecraft server, and read the first relevant error in the Console.
  2. Look for a mod name — Check for messages such as requires environment type CLIENT, invalid dist DEDICATED_SERVER, NoClassDefFoundError, or ClassNotFoundException.
  3. Compare the named file or mod ID — Match it with the files in /mods.
  4. Check the mod author's page — Confirm whether the mod is client-only or has a separate server-compatible release.
Warning: A class-loading error can also be caused by a missing dependency or incompatible version. Do not remove unrelated mods merely because their names appear later in the stack trace.

Remove and Test

  1. Stop the server — Leave it stopped while changing mod files.
  2. Keep a copy — Download the suspected .jar or move it outside /mods so you can restore it if the diagnosis is wrong.
  3. Start once — Start the server and watch the full startup. If it fails again, diagnose the new first relevant error rather than removing several files at once.
  4. Check player clients — Keep client-only mods on player devices when desired. Server-required mods and dependencies must remain compatible on both sides when the mod author requires them.

For other startup failures, follow the Troubleshoot a Server That Will Not Start guide.