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May be you are using an older version of QE in which cell_dofree=‘ibrav’ was not implemented?
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<div class="">Cheers,</div>
<div class="">Vahid<br class="">
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<div>Vahid Askarpour<br class="">
Department of physics and atmospheric science<br class="">
Dalhousie University<br class="">
Halifax, NS<br class="">
Canada</div>
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<blockquote type="cite" class="">
<div class="">On Mar 15, 2020, at 6:06 AM, Fariba Islam <<a href="mailto:ezqhaz@gmail.com" class="">ezqhaz@gmail.com</a>> wrote:</div>
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<span style="font-weight:bold;font-size:12px;" class="">CAUTION:</span> The Sender of this email is not from within Dalhousie.</div>
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<div dir="ltr" class="">Hello,
<div class="">I am following a tutorial and the following code was given there-</div>
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<span style="font-family:"Courier New"" class=""> &control</span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 10.5pt; font-family: Consolas;" class="">
<span style="font-family:"Courier New"" class=""> calculation = 'vc-relax'</span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 10.5pt; font-family: Consolas;" class="">
<span style="font-family:"Courier New"" class=""> prefix = 'Si_exc2'</span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 10.5pt; font-family: Consolas;" class="">
<span style="font-family:"Courier New"" class=""> outdir = './tmp/'</span></div>
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<span style="font-family:"Courier New"" class=""> pseudo_dir = '../pseudo/'</span></div>
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<span style="font-family:"Courier New"" class=""> etot_conv_thr = 1e-5</span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 10.5pt; font-family: Consolas;" class="">
<span style="font-family:"Courier New"" class=""> forc_conv_thr = 1e-4</span></div>
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<span style="font-family:"Courier New"" class="">/</span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 10.5pt; font-family: Consolas;" class="">
<span style="font-family:"Courier New"" class="">&system</span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 10.5pt; font-family: Consolas;" class="">
<span style="font-family:"Courier New"" class=""> ibrav=2, celldm(1) =14, </span>
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<span style="font-family:"Courier New"" class=""> nat=2, ntyp=1,</span></div>
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<span style="font-family:"Courier New"" class=""> ecutwfc=30</span></div>
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<span style="font-family:"Courier New"" class="">/</span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 10.5pt; font-family: Consolas;" class="">
<span style="font-family:"Courier New"" class="">&electrons</span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 10.5pt; font-family: Consolas;" class="">
<span style="font-family:"Courier New"" class=""> conv_thr=1e-7</span></div>
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<span style="font-family:"Courier New"" class="">/</span></div>
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<span style="font-family:"Courier New"" class="">&ions</span></div>
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<span style="font-family:"Courier New"" class="">/</span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 10.5pt; font-family: Consolas;" class="">
<span style="font-family:"Courier New"" class="">&cell</span></div>
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<span style="font-family:"Courier New"" class=""> cell_dofree='ibrav'</span></div>
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<span style="font-family:"Courier New"" class="">/</span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 10.5pt; font-family: Consolas;" class="">
<span style="font-family:"Courier New"" class="">ATOMIC_SPECIES</span></div>
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<span style="font-family:"Courier New"" class=""> Si 28.0855 Si.pbe-n-rrkjus_psl.1.0.0.UPF</span></div>
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<span style="font-family:"Courier New"" class=""> </span></p>
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<span style="font-family:"Courier New"" class="">ATOMIC_POSITIONS (alat)</span></div>
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<span style="font-family:"Courier New"" class=""> Si 0.00 0.00 0.00 0 0 0 </span>
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<span style="font-family:"Courier New"" class=""> Si 0.25 0.25 0.25 0 0 0</span></div>
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<span style="font-family:"Courier New"" class="">K_POINTS (automatic)</span></div>
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<span style="font-family:"Courier New"" class=""> 4 4 4 0 0 0</span></div>
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</span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 10.5pt;" class=""><font face="verdana, sans-serif" class="">I get the following error in CRASH-</font></div>
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