bind 9.10..0-P1 rndc: 'retransfer' failed: not found; other rndc commands are ok

[grantksupport at operamail.com]

> No it isn't.  It is saying the zone isn't found.  "unknown command" is 
> returned for unknown commands.
> 
> 	rndc: 'xxxxx' failed: unknown command

Ok, but the zone IS there.

It's found by other rndc commands.

It's loaded by bind on start.

It's transferred to slaves, again on (re)start.

Why isn't it finding the zone?