Thank You Falko!
i've added the dot sign n also removed the last two A and CNAME line in my zone file...
for these two files, i'll look around...
slaves/my.ddns.internal.zone.db: file not found
internal/my.ddns.internal.zone/IN: file not found
i'll try to troubleshoot again, and let you know the result...
Thanks for the guidance Falko!