hi

when I run a 'scf' calculation in QE code , it gives an error:

"Note: The following floating-point exceptions are signalling: IEEE_UNDERFLOW_FLAG"

do you know about it? how can I fix it?

my input file is this:

&CONTROL

calculation='scf',

outdir='.',

prefix='pwscf',

pseudo_dir=$ESPRESSO_PSEUDO,

verbosity='low',

/

&SYSTEM

ibrav=7,

celldm(1)=16.7225644215d0, celldm(3)=1.4286263165d0,

nat=28,

ntyp=5,

ecutwfc=30,

ecutrho=120,

input_dft='lda',

occupations='smearing',

smearing='mv',

degauss=0.005d0,

/

&ELECTRONS

conv_thr=1d-06,

mixing_beta=0.7d0,

/

ATOMIC_SPECIES

C 12.010700d0 C.UPF

H 1.007940d0 H.UPF

I 126.904000d0 I.UPF

N 14.006700d0 N.UPF

Pb 207.200000d0 Pb.UPF

ATOMIC_POSITIONS {crystal}

Pb 1.0000000000d0 0.0000000000d0 0.0000000000d0

Pb 1.0000000000d0 0.5000000000d0 0.5000000000d0

I 1.0000000000d0 0.2472700000d0 0.2472700000d0

I 1.0000000000d0 0.7472700000d0 0.7472700000d0

I 0.0716570000d0 0.2188315000d0 0.7188315000d0

I 0.9283430000d0 0.7904885000d0 0.2904885000d0

I 0.5000000000d0 0.2904885000d0 0.2188315000d0

I 0.5000000000d0 0.7188315000d0 0.7904885000d0

C 0.5000000000d0 0.8521100000d0 0.3521100000d0

C 0.5000000000d0 0.3521100000d0 0.8521100000d0

N 0.5000000000d0 0.7421100000d0 0.2421100000d0

N 0.5000000000d0 0.2421100000d0 0.7421100000d0

H 0.8135424805d0 0.4337275195d0 0.2472700000d0

H 0.8135424805d0 0.9337275195d0 0.7472700000d0

H 0.8851994805d0 0.4052890195d0 0.7188315000d0

H 0.7418854805d0 0.9769460195d0 0.2904885000d0

H 0.3135424805d0 0.4769460195d0 0.2188315000d0

H 0.3135424805d0 0.9052890195d0 0.7904885000d0

H 0.3838695270d0 0.8808497215d0 0.4969801945d0

H 0.6586371763d0 0.7802777817d0 0.3227844850d0

H 0.4574932967d0 0.9814216613d0 0.3227844850d0

H 0.3838695270d0 0.3808497215d0 0.9969801945d0

H 0.6586371763d0 0.2802777817d0 0.8227844850d0

H 0.4574932967d0 0.4814216613d0 0.8227844850d0

H 0.3860003614d0 0.7138976128d0 0.3278972515d0

H 0.4582732362d0 0.8126241959d0 0.1568977935d0

H 0.3860003614d0 0.2138976128d0 0.8278972515d0

H 0.4582732362d0 0.3126241959d0 0.6568977935d0

K_POINTS {automatic}

1 1 1 0 0 0