The manifest file in a Chrome extension contains important information about the extension, including its version number, permissions, and other details that Chrome needs to know in order to run the extension correctly.
If you're seeing errors related to the manifest version number, it's possible that you're using an outdated version of the manifest file format. To fix this, you'll need to update the version number in your manifest file to the latest format.
Here are the steps to follow:
Open your manifest file in a text editor.
Look for the "manifest_version" key and check the value. The current version is 3.
If the version is lower than 3, update it to 3.
Make sure that all the other keys in the manifest file are compatible with the latest manifest version.
Save the changes to the manifest file.
Reload the extension in Chrome by going to the Extensions page (chrome://extensions/) and clicking the "Reload" button next to your extension.
If you're still having issues, make sure to check the other keys in your manifest file to ensure they are properly formatted and not causing any errors. Additionally, check for any syntax errors or typos in the manifest file that could be causing the errors.