sysctl kern.geom.debugflags ERROR when using Sysinstall to format HD (FreeBsd 7.2 STABLE)

[Jeronimo Calvo]

Hi folks!!

Trying to create a new Ufs on a HD using sysinstall. im getting the
following error:

ERROR: Unable to write data to disk ad10!      │
               │                                               │
               │To edit the labels on a running system set     │
               │sysctl kern.geom.debugflags=16 and try again


any ideas?

Cheers!