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Fabric Server Startup Failure: Missing internalFabricBalmProxy Class #789

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Description

@KonekoBelown

Minecraft Version

1.21.11

Mod Loader

Fabric

Describe the Issue

When starting a Fabric server with CookingForBlockheads 21.11.4 and Balm 21.11.5 for Minecraft 1.21.11, the server fails to start with the following error:

java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'cookingforblockheads'
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: net.blay09.mods.balm.fabric.platform.internalFabricBalmProxy

Environment:

Minecraft: 1.21.11

Fabric Loader: 0.18.4

Fabric API: 0.140.2+1.21.11

CookingForBlockheads: 21.11.4

Balm: 21.11.5

Java: 22 (also tested with Java 21)

OS: Windows 10/11

Steps to Reproduce:

Set up a Fabric server for Minecraft 1.21.11

Install Fabric API 0.140.2+1.21.11

Install Balm 21.11.5 (fabric version)

Install CookingForBlockheads 21.11.4

Start the server

Expected Behavior:
Server should start successfully with all mods loaded.

Actual Behavior:
Server crashes during initialization with ClassNotFoundException for net.blay09.mods.balm.fabric.platform.internalFabricBalmProxy.

Analysis:
After investigation, I found that:

The balm-fabric-21.11.5.jar contains the class at path: net/blay09/mods/balm/fabric/platform/internal/FabricBalmProxy.class (note the internal/ subdirectory)

However, CookingForBlockheads seems to be looking for: net/blay09/mods/balm/fabric/platform/internalFabricBalmProxy.class (without the subdirectory)

interestingly, the cilent fabric minecraft with the same mods launched successfully, but the server jar launched as the crash i reported.

Logs

latest.log

Activity

  1. added theissue type on Jan 16, 2026
  2. BlayTheNinth commented on Jan 16, 2026

    @BlayTheNinth
    Member

    Fixed in Balm 21.11.6

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    BugSomething isn't working as expectedFabricIssues occurring on the Fabric platformMinecraft 1.21.11

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