Import failed. Check your server logs for more information. com.atlassian.confluence.importexport.ImportExportException: Unable to complete import because the data does not match the constraints in the Confluence schema. Cause: PSQLException: ERROR: duplicate key value violates unique constraint "unq_lwr_username" Detail: Key (lower_username)=() already exists.
@Kənan Sahmuradov
This should help you work through this issue. https://confluence.atlassian.com/confkb/confluence-site-xml-import-fails-with-duplicate-key-error-438993638.html
I saw it.but solution didnt work
Does the instance that you are importing from still exist? If you could validate that no duplicates exist in the database and then perform the backup again.
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