This error occurs because the backups were broken in the backup process(mostly becasue of insufficient disk spaces). Please unzip the backups in your local computer to see if they are broken.

If it can be successfully unzipped, please upload the backups via FTP client to the target site (by default to /wp-content/wpvividbackups folder) then click the “Scan uploaded backups and received backups” button to display them in the backup list and restore.

If it can not be unzipped, please create a new backup to upload. Before that, please free up the disk space of the source site. In general, in order to successfully backup a site, the amount of free disk space on the web server usually needs to be twice the size of the website.