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Dynamic Surroundings on Server

Dynamic Surroundings was installed on a server and crashed it. The mod adds client-side ambient audio and visual effects, it has no server component and loads client code that a dedicated server lacks.

What does this error mean?
Dynamic Surroundings enhances client atmosphere (sounds, particles, weather visuals). On a server it tries to load client audio/render code that does not exist for the dedicated server, so it fails. It is a client-only mod. 
Client audio/render code
Most Common Causes
  • The Dynamic Surroundings jar placed on the server.
  • Copying client ambience mods to the server.
  • Assuming ambient effects run server-side.
  • A pack including it in the server set.
  • Mirroring the client mods folder.
How To Diagnose
  1. Confirm the crash names the mod / client audio or render code.
  2. Check the server mods folder for Dynamic Surroundings.
  3. Recall it is a client-only ambience mod.
  4. Look for other client-only mods present.
Recommended Fixes
  • Remove it from the server
    Delete Dynamic Surroundings from the server, players keep it on their clients.
  • Keep ambience mods client-side
    Sound and visual ambience effects run on each player's client only.
  • Separate client/server mods
    Maintain distinct mod lists so client-only mods never reach the server.
  • Audit the mods folder
    Remove other client-only audio/visual mods from the server.
Analyze My Log
Frequently Asked Questions

No, they keep them on their clients. The mod just must not be on the server.

It loads client audio/render classes that a dedicated server does not include.

No, the mod is purely client-side, there is nothing to install on the server.