rsync - Apr 2009 - What could this be? Transfer error code 16

Hy people, where could this be coming from?

rsync: send_files failed to open "Alfredo Polti
SA/wz_ALFREDO_POLTI_SA.ac0" (in Winway_z-32): Device or resource busy
(16)
rsync: send_files failed to open "Alfredo Polti
SA/wz_ALFREDO_POLTI_SA.ac3" (in Winway_z-32): Device or resource busy
(16) rsync error: some files/attrs were not transferred (see previous
errors) (code 23) at main.c(1524) [generator=3.0.5]
WARNING: Some files and/or directories in localhost::Winway_z-32/ only
transferred partially during rsync operation

Flavio Boniforti

PIRAMIDE INFORMATICA SAGL
Via Ballerini 21
6600 Locarno
Switzerland
Phone: +41 91 751 68 81
Fax: +41 91 751 69 14
Url: http://www.piramide.ch
E-mail: flavio@piramide.ch

> This looks like an application is running where the backup is 
> to be made. The application opens and locks the files 
> with an exclusive lock and the rsync program must then wait 
> until it is freed by the application or times out.
> 
> This is a typical problem under Windows. Can you ask the user 
> to close the application?
In fact, that was the issue it seems. Thanks.

Flavio.