Unable to rebuild named Zone entries

[anotheruser]

Apache version: Apache/2.4.39
PHP version: 5.6.37
MySQL version: 10.4.8-MariaDB
FTP version: 1.0.47
CWPpro version: 0.9.8.892

Message being displayed on an empty page after pressing

Code Select Expand

Rebuild Zone

WARNING! username NOT found!

All the named.xxx.db is not found! So what to do?