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[<amir_n_shamkhali@yahoo.com>]

I faced with a problem in running abinit. I'm trying to opt slab model of
Ni(111)surface with 5 layers and 15 angstrom vacuum above it. but when I run
abinis.exe, this 
warning appears:
symspgr: WARNING
could not find the space group
Can anyone help me to solve this problem?
My input file is as follows:

#Ni(111) surface
 dilatmx2   1.10    # Maximum scaling allowed for lattice parameters
  ionmov2   3       # Use BFGS algorithm
   ntime2   30      # Maximum number of optimization steps
 optcell2   2       # Fully optimize unit cell geometry, keeping symmetry
  tolmxf2   1.0e-6  # Convergence limit for forces as above
 strfact2   100     # Test convergence of stresses (Hartree/bohr^3) by
                    # multiplying by this factor and applying force
                    # convergence test
#Common input data

#Starting approximation for the unit cell
  acell   3*6.65901691925241          
  rprim   1.41421193 0.00000000 0.00000000
          0.70710596 1.22474345 0.00000000
          0.00000000 0.00000000 5.00000000
chkprim 0

#Definition of the atom types and atoms
 ntypat   1 
  znucl   28
  natom   20
  typat   20*1

xred    
   0.00000000  0.00000000  0.00000000
   0.49999578  0.00000000  0.00000000
   0.00002170  0.50002309  0.00000000
   0.50001749  0.50002309  0.00000000
   0.16673956  0.16672880  0.11544000
   0.66673534  0.16672880  0.11544000
   0.16676127  0.66675188  0.11544000
   0.66675705  0.66675188  0.11544000
   0.33347912  0.33345759  0.23088000
   0.83347490  0.33345759  0.23088000
   0.33350083  0.83348068  0.23088000
   0.83349661  0.83348068  0.23088000
   0.00000000  0.00000000  0.34634000
   0.49999578  0.00000000  0.34634000
   0.00002170  0.50002309  0.34634000
   0.50001749  0.50002309  0.34634000
   0.16673956  0.16672880  0.46178000
   0.66673534  0.16672880  0.46178000
   0.16676127  0.66675188  0.46178000
   0.66675705  0.66675188  0.46178000

#Gives the number of bands, explicitely (do not take the default)
  nband   300              # For an insulator (if described correctly as an 
                           # insulator by DFT), conduction bands should not
                           # be included in response-function calculations

#Definition of the plane wave basis set
   ecut   12.0             # Maximum kinetic energy cutoff (Hartree)
   ecutsm   0.5            # Smoothing energy needed for lattice paramete
                           # optimization.  This will be retained for
                           # consistency throughout.

#Definition of the k-point grid
  kptopt  1
  ngkpt   6 6 1          # 4x4x4 Monkhorst-Pack grid
                         # Use one copy of grid only (default)


#Definition of the self-consistency procedure
 diemac   9.0            # Model dielectric preconditioner
   iscf   5              # Use conjugate-gradient SCF cycle
  nstep   100             # Maxiumum number of SCF iterations
 tolvrs   1.0d-18        # Strict tolerance on (squared) residual of the
                         # SCF potential needed for accurate forces and
                         # stresses in the structural optimization, and
                         # accurate wave functions in the RF calculations