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<p>Can you share your PW and PH input and output files using Google Drive? Did you check whether the PW calculation finished successfully?</p>
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<p>If the PW calculation finished successfully, then you can try to remove <span>
recover=.true.</span> in the PH input and try again.<br>
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<p>Greetings,</p>
<p>Iurii<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> users <users-bounces@lists.quantum-espresso.org> on behalf of Dr. K. C. Bhamu <kcbhamu85@gmail.com><br>
<b>Sent:</b> Tuesday, December 1, 2020 12:04:50 PM<br>
<b>To:</b> Quantum Espresso users Forum<br>
<b>Subject:</b> [QE-users] Error in routine diropn (34): can't open a connected unit</font>
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<div class="gmail_default" style="font-size:large">Dear Users</div>
<div class="gmail_default" style="font-size:large">I am trying to calculate the phonon band structure of Ni(OH)2 slab on a well converged scf.</div>
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<div class="gmail_default" style="font-size:large">I am using QE version 6.6 (also tried 6.5 and 6.4.1). QE is compiled with the mkl-2020.2.254 parallel library.</div>
<div class="gmail_default" style="font-size:large">I am getting below error:</div>
<div class="gmail_default" style="font-size:large"><br>
     Error in routine diropn (34):<br>
     can't open a connected unit<br>
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%<br>
<br>
     stopping ...<br>
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<div class="gmail_default" style="font-size:large"><br>
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<div class="gmail_default" style="font-size:large">I have checked the mailing list but it could not help me.</div>
<div class="gmail_default" style="font-size:large">For the bulk system, it is running well.</div>
<div class="gmail_default" style="font-size:large"><br>
</div>
<div class="gmail_default" style="font-size:large">Below are my <a href="http://qe.in">
qe.in</a> and <a href="http://ph.in">ph.in</a> files:</div>
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<div class="gmail_default" style="font-size:large">&CONTROL<br>
                 calculation = 'scf'<br>
                      outdir = './tmp'<br>
                  pseudo_dir = './'<br>
                      prefix = 'pwscf'<br>
                   verbosity = 'default'<br>
               etot_conv_thr = 0.00001<br>
               forc_conv_thr = 0.0001<br>
                       nstep = 400<br>
                     tstress = .true.<br>
                     tprnfor = .true.<br>
<br>
/<br>
<br>
&SYSTEM<br>
                       ibrav = 0<br>
                    celldm(1)=42.3160703759d0,<br>
                         nat = 15<br>
                        ntyp = 3<br>
                     ecutwfc = 85<br>
                     ecutrho = 680<br>
    starting_magnetization(1)= 1,<br>
    occupations='smearing', smearing='mv', degauss=0.005,<br>
    nspin=2,<br>
    lda_plus_u=.true.  Hubbard_U(1)=5.5<br>
<br>
 /<br>
 &ELECTRONS<br>
            electron_maxstep = 700<br>
                    conv_thr = 1.0D-8<br>
 /<br>
&IONS<br>
                ion_dynamics = 'bfgs'<br>
 /<br>
&CELL<br>
/<br>
ATOMIC_SPECIES<br>
Ni     58.6934 ni_pbe_v1.4.uspp.F.UPF<br>
H      1.00794 H.pbe-rrkjus_psl.1.0.0.UPF<br>
O      15.9994 O.pbe-n-kjpaw_psl.0.1.UPF<br>
<br>
ATOMIC_POSITIONS {crystal}<br>
Ni            0.4086271180        0.2500000000        0.0562779067<br>
Ni            0.5310297978        0.7500000000        0.1575988843<br>
Ni            0.6555917806        0.2500000000        0.2252620504<br>
H             0.3556718912        0.7500000000        0.7569475855<br>
H             0.4905989850        0.2500000000        0.7519547270<br>
H             0.6813126358        0.7500000000        0.8495914755<br>
H             0.3051177957        0.2500000000        0.2908234852<br>
H             0.4287025160        0.7500000000        0.4856771252<br>
H             0.5663785349        0.2500000000        0.5842143961<br>
O             0.3991582306        0.7500000000        0.7744084930<br>
O             0.5245603948        0.2500000000        0.8820391483<br>
O             0.6867859121        0.7500000000        1.0544632655<br>
O             0.3217306969        0.2500000000        0.0997462181<br>
O             0.4457256438        0.7500000000        0.2821321300<br>
O             0.5751880668        0.2500000000        0.3748931091<br>
<br>
CELL_PARAMETERS {alat}<br>
  1.000000000000d0  0.000000000000d0  0.000000000000d0<br>
  0.000000000000d0  0.142952837309d0  0.000000000000d0<br>
  0.000000000000d0  0.000000000000d0  0.209983610730d0<br>
<br>
K_POINTS automatic<br>
1 4 4   0 0 0<br>
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<div class="gmail_default" style="font-size:large"><a href="http://ph.in">ph.in</a></div>
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<div class="gmail_default" style="font-size:large">&inputph<br>
recover=.true.,<br>
tr2_ph = 1.0d-12<br>
prefix ='pwscf'<br>
alpha_mix =0.3<br>
ldisp = .true.,<br>
trans=.true.,<br>
fildvscf='dvscf'<br>
electron_phonon= " "<br>
nq1=1<br>
nq2=4<br>
nq3=4<br>
outdir ='./tmp'<br>
fildyn = 'slab.dyn'<br>
/<br>
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<div class="gmail_default" style="font-size:large">Any suggestion will be appreciated.</div>
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<div class="gmail_default" style="font-size:large">Thank you very much.</div>
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<div class="gmail_default" style="font-size:large">K.C. Bhamu</div>
<div class="gmail_default" style="font-size:large">Postdoctoral Fellow</div>
<div class="gmail_default" style="font-size:large">University of Ulsan</div>
<div class="gmail_default" style="font-size:large">ROK</div>
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