can't switch on domain, ftp_on_off error

[admin@webfactor]

Hello Igor

When I try to switch on a domain , ftp user remain disabled , dns disabled and so on IIS app pool disabled...
When I try to turn on the domain from console I get:

C:\Program Files (x86)\Parallels\Plesk\admin\bin>domainmng.exe --turn-on --domain-name=xxxxxx.com
Execute ftpmng --install-vhost --soft "--vhost-name=xxxxxx.com" failed:
at (execUtil line 133)
at Execute C:\Program Files (x86)\Parallels\Plesk\admin\bin\ftpmng --install-vhost --soft "--vhost-name=xxxxxx.com"(execUtil line 153)
at Turn on ftp service for domain xxxxxx.com(domainmng::ftp_on_off line 432)
at (domainmng::ftp_on_off line 433)
at Turn on domain xxxxxx.com (state=8)(domainmng::turnDomain line 141)

Plesk 8.6 , windows 2008 R2 std
Please help .