请问各位老师，vasp在计算NMR的化学位移的时候，出现错误，是什么原因呢？

hanmengsha

vasp在计算NMR的化学位移的时候，出现了以下错误：
Warning: Lapack routine DSTEDC failed, info=       23, Trying DSTEQR!Warning: Lapack routine DSTEDC failed, info=       23, Trying DSTEQR!
Warning: Lapack routine DSTEDC failed, info=       19, Trying DSTEQR!
Warning: Lapack routine DSTEDC failed, info=       19, Trying DSTEQR!

以下是INCAR：
SYSTEM = graphene

GGA    = PE
ISTART = 1
ICHARG = 0
INIWAV = 1
LREAL=Auto
ISYM   = 0
ISPIN  = 2
ALGO=VeryFast
IVDW=11
NCORE  = 8
Ionic minimisation
NSW    = 0
ISIF   = 2
IBRION = 2
#  EDIFFG = -2E-2
POTIM  = 0.1

Electronic minimisation
IALGO = 48
LWAVE  = .TRUE.
EMIN =   -20.0  
EMAX =   10.0
NEDOS = 1601

Chemical Shift
PREC = Normal      # nice
ENCUT = 600.0      # typically higher cutoffs than usual are needed
ISMEAR = 0; SIGMA= 0.1 # no fancy smearings, SIGMA sufficiently small
EDIFF = 1E-9       # you'd need much smaller EDIFFs.

LCHIMAG = .TRUE.   # to switch on linear response for chemical shifts
DQ = 0.001         # often the default is sufficient
ICHIBARE = 1       # often the default is sufficient
LNMR_SYM_RED = .TRUE. # be on the safe side
NBANDS = 704        # to safe memory, ??? = NELECT/
NELECT=64