[07-Jun-2018 11:29:31 UTC] PHP Warning:  unlink(/tmp/invoices.zip): Operation not permitted in /home/platne/serwer20021/public_html/wp-content/plugins/flexible-invoices/class/invoicePostType.php on line 720
[07-Jun-2018 11:29:34 UTC] PHP Warning:  ZipArchive::close(): Renaming temporary file failed: Operation not permitted in /home/platne/serwer20021/public_html/wp-content/plugins/flexible-invoices/class/invoicePostType.php on line 764