Why is my project not running?

Started by AddingUraniumT… on Wed, 04/01/2026 - 20:14

Topic category: Troubleshooting, bugs, and solutions

I was trying to run my mod that I've been working on (I throw whatever idea I have in there) and for some reason, it doesn't work. It ran perfectly fine yesterday?? I didn't change anything??

here's the logs:

Executing Gradle task: runClient
Build info: MCreator 2026.1.13616, fabric-1.21.8, 64-bit, 8192 MB, Mac OS X, JVM 21.0.10, JAVA_HOME: /Applications/MCreator.app/Contents/jdk.bundle/Contents/Home, started on: 2026-04-01-16:11:10

> Configure project :
Fabric Loom: 1.15.5
> Task :compileJava FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':compileJava'.
> Java compilation initialization error
error: release version 21 not supported
* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights from a Build Scan (powered by Develocity).
> Get more help at https://help.gradle.org.
BUILD FAILED in 2s
1 actionable task: 1 executed

BUILD FAILED
Task completed in 2 seconds

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I see you’re on MacOS and it says “MacOS X” (I don’t know if it always says that for Mac, but if you’re on an earlier version than Big Sur 11, MCreator is unsupported. In that case, I’d recommend updating MacOS).
In general, check out: https://mcreator.net/wiki/gradle-setup-errors
I see you’re using the Fabric Generator. This is its own plugin and you may want support from people more familiar with the fabric generator, or this could be a bug with that. If you can a reproducible set of steps and understand a bug that causes this, you should report that on The Fabric Generator Plugin’s issue tracker.

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Restarting my mac appeared to work, thanks nevertheless!

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