CDFT errors

[Shreya Verma]

I am trying to constrain charge on a system of two organic molecules using CDFT module. I am using LC-wPBE/6-31+G** with vdw 4 for dispersion correction and trying task dft energy. I am getting the following error:

CDFT: Unable to improve the multipliers

and also 

WARNING : Found    19 linear dependencies

I have tried different options: 

direct

smear

odft

set quickguess t

set lindep:n_dep 0

When I used 'direct' and 'set quickguess t' together without the other options mentioned above, I got this error:

   convergence    iter        energy       DeltaE   RMS-Dens  Diis-err    time

 ---------------- ----- ----------------- --------- --------- ---------  ------

 d= 0,ls=0.0,diis     1  -1711.1098949080 -5.66D+03  7.02D-03  1.07D+02  1202.6

                                                          NaN  1.07D+02

           Kinetic energy =                 NaN

 CDFT multipliers:

      1        0.0000000000

      2        0.0000000000

      iter =    1

 PeIGS error from ystebz 4 ...trying ysterf

Can anyone please suggest any other solution to tackle this problem?

Thanks in advance.

[Edoardo Aprà]

What happens if you use the 6-31g* basis set instead of 6-31+g** ?

[Shreya Verma]

I still get the same: 

CDFT : Unable to improve the multipliers

and the same warning for linear dependencies which were ignored on using- set lindep:n_dep 0

[Edoardo Aprà]

What happens if you remove the CDFT input section?

[Shreya Verma]

Then I just get the SCF energy of the combined system of two molecules. Currently I am doing 'task dft energy' only.