pair_style lj/sf

I am trying to shift and truncate my lj potential. So I am applying the following two commands:
pair_style lj/sf 1.1224

pair_coeff 1 1 1.0 1.0 1.1224

But it is giving an

ERROR: Invalid pair style (…/force.cpp:175)

I am trying to shift and truncate my lj potential. So I am applying the following two commands:
pair_style lj/sf 1.1224
pair_coeff 1 1 1.0 1.0 1.1224

But it is giving an
ERROR: Invalid pair style (…/force.cpp:175)

… and did you look up what this error means?

Maybe the package is not installed properly?

Maybe the package is not installed properly?

and?