Error: Could not find or load main class net.fabricmc.devlaunchinjector.Main | Together Java | Page 1

solid sluice Mar 30, 2026, 1:38 PM

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I'm having this trouble, even though i tried deleting the .idea file loads of times and refreshing the gradle and more, still i keep getting this error on runClient()

sleek terraceBOT Mar 30, 2026, 1:38 PM

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<@&987246652869971988> please have a look, thanks.

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Here is an AI assisted attempt to answer your question 🤖. Maybe it helps! In any case, a human is on the way 👍. To continue talking to the AI, you can use </chatgpt:1108714622413963314>.

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TJ-Bot

I'm having this trouble, even though i tried deleting the .idea file loads of times and refreshing the gradle and more, still i keep getting this error on runClient()

The error Could not find or load main class net.fabricmc.devlaunchinjector.Main usually means the Fabric development environment isn’t set up correctly, or the runClient configuration can’t locate the Fabric Dev Launch Injector main class.

Common causes:

Fabric Loom not fully or correctly installed/configured in build.gradle.
Gradle hasn’t properly generated the run configurations.
IDE run configurations are outdated or incorrectly linked.
Missing Fabric API or Fabric Loader dependencies.

Since you already tried deleting .idea and refreshing Gradle, check the following in your old setup:

Make sure you have the right Fabric Loom plugin version in your build.gradle file.
Confirm your runClient task is defined correctly (usually inside the gradle section with tasks like runClient and proper working directory).
Run ./gradlew genSources and ./gradlew runClient from terminal to isolate IDE issues.
Ensure Fabric Loader and API are specified as dependencies in build.gradle.
If you imported from git or external sources, verify no cache issues (.gradle folder can be deleted and refreshed).

In short, this is a classpath or build setup problem, often related to Fabric Loom integration. The old code and gradle files can provide insight into whether Loom and dependencies are declared properly.

Useful links:

solid sluice Mar 30, 2026, 1:49 PM

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i tried changing some code

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andd

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package com.voidwalker.mod.mixin;

import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import net.minecraft.client.render.WorldRenderer;
import org.joml.Matrix4f;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;

@Environment(EnvType.CLIENT)
@Mixin(WorldRenderer.class)
public class MixinWorldRenderer {

@Inject(
        method = "renderSky",
        at = @At("TAIL")
)
private void onRenderSkyTail(
        net.minecraft.client.util.math.MatrixStack matrices,
        Matrix4f projectionMatrix,
        float tickDelta,
        net.minecraft.client.render.Camera camera,
        boolean thickFog,
        Runnable fogCallback,
        CallbackInfo ci
) {
    
}

}

(My code as right now for MixinWorldRenderer file)

but on run i get a crash:

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📎 message.txt

sleek terraceBOT Mar 30, 2026, 2:46 PM

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TJ-Bot

Https://sending.pastefor.help/upload/f36ecc75 https://sending.pastefor.help/upload/14666e7e Can you help identify the error?

I can’t fetch those external URLs. Please paste the old code snippet and the exact error message / stack trace here. Meanwhile, quick checklist and targeted debugging steps to help you identify the error without rewriting the code:

What I need from you

The exact error text + full stack trace (copy-paste).
The specific file(s) and the lines around where the stack trace points.
Runtime (language + version), OS, and how you run it (command, container, CI).

Quick checklist (look in the old code)

Read the stack trace: note filename and line number first.
Syntax / indentation errors (Python) or missing semicolons / braces (JS/C-like).
Name errors: misspelled variable/function or shadowing.
Wrong import/path: relative vs absolute import or wrong module name.
Type mismatches: accessing attributes on None / wrong return type.
Index/key errors: out-of-range index or missing dict key.
Async misuse: forgetting await or mixing sync/async APIs.
Dependency/version mismatch: API changed between versions.
File/permission/encoding: missing file or incorrect encoding.
JSON/API parsing: unexpected response structure or unhandled status codes.
Race/ordering: uninitialized variable due to concurrency.
Environment variables/API keys missing or misconfigured.

Debug steps

Reproduce locally and copy full traceback.
Add minimal logging/print at the failing line to inspect values.
Run debugger (pdb / breakpoints) to inspect state.
Run linters or type-checkers (mypy, eslint).
Bisect recent commits to find regression.

Paste the old code around the failing lines + the stack trace and I’ll point to the exact error.

#Error: Could not find or load main class net.fabricmc.devlaunchinjector.Main