I built a small Chrome extension - it shows your IP and geolocation information. I tested it several times, packed it (using Grunt), and uploaded it to the Chrome Web Store. I checked several times that the resulting zip file contains all the files needed by the application + manifest.
Then I uninstalled my local version and tried to install it from the online store. I keep getting this error, even after updating, and restart the browser several times:
"Failed to add this item to Chrome. Please refresh and try again."

How do I debug / solve this problem?
- The code for my extension is very simple and actually open on GitHub .
- The manifest file is available here .
- The extension is available in the Chrome store here .
Update :
Looking at the JS console, I see an error every time I press the install button:
webstorePrivate.beginInstallWithManifest3: invalid manifest
There is no additional information, and for me the manifest file looks fine (and it works when loading locally).
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