It is a warning (advice), not a specific error. There is no general 'Fix"
just look at what they are.
they imply instructions on how to use hyphens... and from the looks, for 3 different render systems.
In General, if a system does not recognize a well formed command, it is supposed to ignore it.
If you happen to have one of those few devices that
fails the ignore bit, remove those lines. all you lose is the fine control of hyphens that the coder demanded.