rndc reload zone : file not found

Hello,

A whole reload with rndc works on our server, but I tried to reload only a
single zone with rndc, and it doesn't work any more, it displays this error
message.
rndc: 'reload' failed: not found

It used to work on our server last year if I remember well... I wonder if it
can be a consequence of our new 2-views configurations.

Any idea ?

Thank you,

Zal