Unity Gradle Daemon Error – Fix Incompatible Daemon Issue

The Error Message

“Starting a Gradle Daemon, 1 incompatible Daemon could not be reused, use —status for details”

This error message typically indicates that there is an incompatible version of the Gradle daemon running on your system. To solve this issue, you can try the following steps:

Quick Fixes

Before continuing, make a backup copy of your Unity project.

Clear the Library Folder

Stop Unity
Delete your Library folder (e.g., D:\YOUR_UNITY_PROJECT\Library)
Restart Unity and wait for reimport to complete
Try building again

Kill Gradle Daemons

Open a terminal/command prompt and run:

# Windows
gradle --stop

# macOS/Linux
./gradlew --stop

Or manually kill all Java processes related to Gradle.

Detailed Solutions

Solution 1: Update Gradle Version

Unity bundles a specific Gradle version. If your system has an older or conflicting version:

Go to Edit → Preferences → External Tools
Under Gradle Installation, select “Embedded Gradle” (recommended)
Or specify the correct Gradle path matching your Unity version

Solution 2: Clean Build Cache

# Navigate to your project's Library folder
cd YourProject/Library

# Delete cached files
rm -rf gradle*
rm -rf .gradle*

# Return to Unity and rebuild

Solution 3: Check Java Version Compatibility

Gradle requires a specific Java version. Verify your setup:

Unity Version	Required Java
2019.x - 2020.x	Java 8 or 11
2021.x - 2022.x	Java 11 or 17
2023.x+	Java 17

Check your Java version:

java -version

Solution 4: Reinstall Unity Android Build Support

Open Unity Hub
Go to Installs → Your Unity Version → Add Modules
Uncheck and recheck Android Build Support
Click Install to reinstall

Prevention Tips

Always use the Embedded Gradle option in Unity preferences
Keep your JDK/Java installation up to date
Regularly clean the Library folder when experiencing build issues
Use LTS (Long Term Support) Unity versions for production projects

Why Is My Unity Build Slow? – Optimize build performance
Mobile Game Design Process – Design for mobile platforms
Best Unity Assets 2025 – Tools for Android development

Still experiencing Gradle issues? Check our Support page or contact us at [email protected]. 🛠️✨