[lammps-users] vel option

Greetings

How to set the vel=yes option? . I am trying to compute the Flux, and I am getting no satisfaction.
ERROR: Compute heat/flux requires ghost atoms store velocity
which I suppose should be fixed either by changing ghost atoms parameter or setting vel option
The manual says:

ERROR: Compute heat/flux requires ghost atoms store velocity

Again, if you're getting this error, you are not using the most
current version of LAMMPS. Compute h/f no longer requires
this. If you want to use the old version, then the command is,
for example,

communicate single vel yes

Steve