one output problem of G98

Dear all,
 To optimize force fields we need the force constants in Cartesian
 coordinates. For the small
 molecules, G98 does give this output with #p, however there is no such
 output for the bigger molecules with more than 50 atoms. Does anybody know
 how to solve the problem?
 Yixuan Wang
 Department of Chemical  Engineering
 University of  South Carolina
 Columbia, SC 29208