Software⏱️ 2 min read📅 2026-05-30

How to Fix: Judge0 returning null values and error saying box.c file cannot be created

Learn how to fix: Judge0 returning null values and error saying box.c file cannot be created.

Quick Answer: Try checking your system settings or restarting.

The error you're encountering, 'box.c file cannot be created,' is typically associated with issues related to the environment or permissions in your system. When Judge0 fails to create a box (in this case, 'box.c'), it usually indicates that there's an issue with the Docker environment or the container's permissions.

Why is my code execution not happening?

  • One possible cause for non-execution of your code could be related to the Docker environment's configuration or the way Judge0 handles containerization.

How can I resolve this issue?

Method 1: Check Docker Environment

  1. Step 1: Ensure your Docker environment is properly configured and that Judge0 can access the correct ports.

Method 2: Modify Judge0 Settings

  1. Step 1: Check the Judge0 documentation to see if there are any specific settings or configurations that can be adjusted for better performance or compatibility with your environment.

Additional Tips

To troubleshoot further, ensure that Judge0 is running the latest version and that there are no known issues with your specific setup. If you're still having trouble after trying these methods, consider reaching out to the Judge0 support team for personalized assistance.

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