Скачать или смотреть Fixing the Could not read source map error when running your Flutter app on Chrome

Discover how to resolve the `Could not read source map for chrome-error://chromewebdata/:` error while running your Flutter app on Chrome. Learn effective troubleshooting techniques.
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This video is based on the question https://stackoverflow.com/q/77859610/ asked by the user 'ameen' ( https://stackoverflow.com/u/23268952/ ) and on the answer https://stackoverflow.com/a/77895051/ provided by the user 'Lorenzo Delana' ( https://stackoverflow.com/u/5521766/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting the "Could Not Read Source Map" Error in Flutter on Chrome

When trying to run your Flutter app on Google Chrome, encountering mysterious error messages can be frustrating. One such error is: "Could not read source map for chrome-error://chromewebdata/:". This error indicates an unexpected 503 response, leading to confusion and halting your work. In this guide, we will unpack this issue, give an overview of its causes, and guide you toward potential solutions.

Understanding the Error

What Does the Error Mean?

The error message you're seeing points to an issue with loading a source map in Chrome. Source maps are crucial for debugging your application because they link your minified JavaScript code back to the original source code, allowing you to see and debug the actual code where errors occur. A 503 response typically indicates that there is an issue with the server or service that the resource is trying to access.

Symptoms of the Error

Your Flutter app fails to load in Chrome.

The console displays the source map error instead of your application.

You may notice other related errors when trying to debug or interact with your application.

Analyzing the Causes of the Error

While there could be various causes for this error, they usually relate to how your application or browser is set up. Based on user experiences, a similar error has been linked to missing reference files in older apps or misconfigurations as seen during development.

Common Causes:

Missing Reference in HTML:

If the index.html file is missing, the app cannot find the entry point to load the entire application. This is often the root cause in applications that have been upgraded or modified.

Browser Caching Issues:

Sometimes, a corrupted cache may lead to problems when trying to read source maps.

Incompatibility with Chrome:

Certain browser extensions or settings may interfere with the loading of the app.

Steps to Resolve the Error

Now that we understand what this error means and its possible roots, let's look at actionable steps you can take to troubleshoot and fix the issue.

Step 1: Check Your index.html File

Make sure that your Flutter application's index.html file is present and correctly references your main source file.

The index.html file needs to have links to all necessary modules including the entry point, for example, /src/index.tsx. If this file is missing, your application won't run correctly.

Step 2: Clear Browser Cache

Clearing the browser cache is a basic yet effective first step that can resolve many issues.

Go to Chrome's settings > Privacy and Security > Clear browsing data.

Make sure to select "Cached images and files".

Step 3: Check for Extensions or Settings Conflicts

Temporarily disable any unnecessary browser extensions particularly those that may interfere with web applications.

Check your browser settings to make sure nothing is blocking the loading of local files.

Step 4: Test with Another Browser

If the problem persists, try running your Flutter app in a different browser, such as Firefox or Safari. This can help determine if the issue is specific to Chrome.

Conclusion

Encountering the "Could not read source map for chrome-error://chromewebdata/:" error in Flutter can be daunting, but with a systematic approach, you can resolve it. By ensuring that your index.html is properly configured, clearing your cache, and checking for conflicts, you can get back to developing and debugging your application smoothly.

Follow these steps and, hopefully, you'll see your Flutter app running perfectly in Chrome in no time!