PROJ.4

HELP!!!!

Im trying to convert from UTM to State Planer for NJ.

For zones:
    utm zone = 18
    NJ zone = 2900

Unfortunately, Im getting an error when converting from
UTM to Lat/LONG because the * symbol appears.

proj +proj=utm +zone=18 +inv

After this I enter the coordinates I recieved from the
reverse direction, and thus an error appears!

Does anyone know of a way to convert from UTM to State
planer without going through Lat/Long? Or can solve my
current problem.

Thanks for any help.

Kym M. Lenkus
Davidson Laboratory