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This notification indicates that there is an unexpected element (“base-extension”) in the XML file. This is likely due to changes in the Android SDK version that you have upgraded to, which may have introduced a new element that is not recognized by your code. To fix this, you should review the XML file and make the necessary changes to ensure compatibility with the new SDK version. You can also refer to the documentation for the new SDK version to understand any new elements or changes that may have been introduced.