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[<6671011@163.com>]

Dear friends,

    While calculating the Raman spectra of molecule H2O with only Gamma 
kpoint,
I found the non-linear DATASET failed with the following output.

----------------------------------------------------------------------------------------
 nonlinear : nkpt, nkpt3 =            1           1
 getkgrid : length of smallest supercell vector (bohr)=    7.445834E+00
       Simple Lattice Grid
 nonlinear : nkpt, nkpt3 =            1           1
 getkgrid : length of smallest supercell vector (bohr)=    7.445834E+00
       Simple Lattice Grid

 getshell: BUG -
 Cannot find enough neighbor shells
  Action : contact ABINIT group.
----------------------------------------------------------------------------------------

    To overcome this problem, I need to use more kpoints, such as ngkpt 2 2 2.
So, does it mean that the non-linear RF does not support a single kpoint
calculation?

 P.S. I tested it in both Abinit 5.6.4 and 5.7.3. (You can repeat this problem
by changing the kpoint parameters in the build-in test file tnol_2.in)

Sincerely,
Guangfu Luo