microsoft / microsoft/pxt-microbit
[Code Evaluation] Evaluation fails for JavaScript and Python projects with "Unable to evaluate" error
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Since Jul 2, 2026.
- Dominant language
- TypeScript
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Description
Describe the bug
When evaluating JavaScript or Python projects in the Code Evaluation tool, the system fails and displays an error message (Unable to evaluate – An unexpected error occurred).
Steps to reproduce the behavior:
- Navigate to MakeCode Code Evaluation.
- Enter a JavaScript or Python Share Project link, e.g. JavaScript: https://makecode.microbit.org/S38180-65764-35865-76506.
- Create or select a checklist containing one or more evaluation criteria.
- Click Evaluate and observe the checklist state.
Actual behavior
Evaluation shows: “Unable to evaluate – An unexpected error occurred” for all checklist items.
Expected behavior
JavaScript and Python projects should be evaluated successfully according to checklist criteria.
Screenshots
Additional context
1.OS: Windows 11 25H2
2.Browser: Chrome, Edge, and Firefox
3.makecode.microbit.org version: 8.1.28
4.Microsoft MakeCode version: 12.3.24
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Assessment
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