export an apk file

Hi! I have a problem.After I tried to export an apk file I took this messages:
Error:The element type "application" must be terminated by the matching end-tag "</application>".
Error:A problem occurred configuring project ':app'.
> javax.xml.xpath.XPathExpressionException: org.xml.sax.SAXParseException; lineNumber: 21; columnNumber: 3; The element type "application" must be terminated by the matching end-tag "</application>".
What happened?How I solve this problem? Thank you.

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