bsse and second derivatives in G98

[Dominik Horinek <Dominik.Horinek ^at^ chemie.uni-regensburg.de>]

Hello,
 I'm trying to calculate the hessian of a cluster containing an organic
 molecule (formic acid) and an argon atom. To account for the bsse I have
 to do the calculation with ghost atoms for the organic molecule and
 electrons only at the argon atom. Unfortunately, with G98 this type of
 calculation fails: 'Molecule is non-linear but NTrRo=3'. Who knows how
 to fix this problem, or is there another convenient way to obtain the
 second derivatives without this problem. I used the following input:
 %Mem=12000000
 %chk=cluster_1.chk
 # 6-311++G** MP2=Direct Freq Massage
  *cluster 1*
 0   1
  C   0.0000000  0.0000010 -0.0000110
  O   0.0000000 -1.1524620 -0.3291650
  H   0.0000000  0.3427030  1.0490010
  O   0.0000000  1.0156520 -0.8967590
  H   0.0000000  1.8484450 -0.4113800
 Ar  -5.3307700 -4.9821510 -5.6341740
    1  Nuc  0.0
    2  Nuc  0.0
    3  Nuc  0.0
    4  Nuc  0.0
    5  Nuc  0.0
 Thanks for any help,
 Dominik