Hi venkata,
Please make sure the xml file has valid root element. As you said, you have not changed to element.xml, I would suggest you can uninstall the feature and then reinstall the feature again to test if it works.
Here is a similiar thread for your reference:
https://social.technet.microsoft.com/Forums/sharepoint/en-US/15947286-882b-48fe-a8f4-b418806b18e9/root-element-missing
Thanks
Best Regards
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