problem to have log

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Hi,
I have this config for logging in my named.conf file:

logging {
  category "default" { "debug"; };
  category "general" { "debug"; };
  category "database" { "debug"; };
  category "security" { "debug"; };
  category "config" { "debug"; };
  category "resolver" { "debug"; };
  category "xfer-in" { "debug"; };
  category "xfer-out" { "debug"; };
  category "notify" { "debug"; };
  category "client" { "debug"; };
  category "unmatched" { "debug"; };
  category "network" { "debug"; };
  category "update" { "debug"; };
  category "queries" { "debug"; };
  category "dispatch" { "debug"; };
  category "dnssec" { "debug"; };
  category "lame-servers" { "debug"; };
  channel "debug" {
    file "/var/log/bind-debug" versions 2 size 50m;
    print-time yes;
print-category yes;
  };
};

But i have no log.... the file /var/log/bind-debug doesn't exist... I tried
to start the server this the -d 9 option (named -d 9 -u named ), but the
problem is the same.
What's wrong???
Thanks for your help

vincent