<p>A more general comment. As described in the user guide, for every command there is a .def file, for instance lapw1.def or uplapw1.def. This file is created by the &quot;x&quot; command. If you read the relevant .def file you will see that it has the unit number as well as the file name. You can then track back to what is wrong, perhaps as Gavin says mixing spin and no spin.</p>

<p>You can do the same for all commands. It is a good learning experience to look, and also look and understand what the &quot;x&quot; command is doing.</p>
<p>---------------------------<br>
Professor Laurence Marks<br>
Department of Materials Science and Engineering<br>
Northwestern University<br>
<a href="http://www.numis.northwestern.edu">www.numis.northwestern.edu</a> 1-847-491-3996<br>
&quot;Research is to see what everybody else has seen, and to think what nobody else has thought&quot;<br>
Albert Szent-Gyorgi<br>
</p>
<div class="gmail_quote">On May 20, 2012 8:43 PM, &quot;Gavin Abo&quot; &lt;<a href="mailto:gsabo@crimson.ua.edu">gsabo@crimson.ua.edu</a>&gt; wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">




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The error message &quot;<span><span><span lang="en"><span>can not open</span>
<span>unit</span> <span>18</span></span></span></span>&quot; seems incomplete. 
<br>
<br>
I can only guess that maybe you mixed a non-spin polarized and spin polarized run. 
<br>
<br>
See: <a href="http://zeus.theochem.tuwien.ac.at/pipermail/wien/2010-June/013366.html" target="_blank">
http://zeus.theochem.tuwien.ac.at/pipermail/wien/2010-June/013366.html</a><br>
<br>
You can also find some other posts on the &quot;unit 18&quot; error by older archives search at:
<a href="http://www.wien2k.at/reg_user/mailing_list/" target="_blank">
http://www.wien2k.at/reg_user/mailing_list/</a><br>
<br>
On 5/20/2012 3:39 PM, Mouna Mesbahi wrote:
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<div><span><span><span lang="en"><span>hello</span><span>;</span><br>
<span>Please</span> <span>I have</span>
<span>a</span> <span>system</span>
<span>in</span> <span>which</span>
<span>I have</span> <span>a</span>
<span>nickel</span> <span>atom</span>
<span>(</span><span>transition material</span><span>)</span>
<span>in</span> <span>the optimization stage</span>
<span>I</span> <span>afffiche</span>
<span>error in</span> <span>lapw1</span>
<span>(</span><span>can not open</span>
<span>unit</span> <span>18)</span>
<span>how to solve this</span> <span>
problem</span> <span>please</span><br>
<span>thank you in advance</span><br>
<span>cordially</span> <span>mouna<var></var></span></span></span><br>
</span></div>
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<div style="FONT-FAMILY:times new roman,new york,times,serif;FONT-SIZE:12pt">
<div dir="ltr"><font face="Arial"><b><span style="FONT-WEIGHT:bold">De :</span></b> Mouna Mesbahi
<a href="mailto:mouna.mesbahi@yahoo.fr" target="_blank">&lt;mouna.mesbahi@yahoo.fr&gt;</a><br>
<b><span style="FONT-WEIGHT:bold">À :</span></b> <a href="mailto:wien@zeus.theochem.tuwien.ac.at" target="_blank">
&quot;wien@zeus.theochem.tuwien.ac.at&quot;</a> <a href="mailto:wien@zeus.theochem.tuwien.ac.at" target="_blank">
&lt;wien@zeus.theochem.tuwien.ac.at&gt;</a> <br>
<b><span style="FONT-WEIGHT:bold">Envoyé le :</span></b> Vendredi 20 janvier 2012 13h36<br>
<b><span style="FONT-WEIGHT:bold">Objet :</span></b> <br>
</font></div>
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<div style="font-size:12pt;font-family:times new roman,new york,times,serif">
<div>I have already tried the dituted semicondictors please i want to ask you if it is obliged to pass by the generation of supercelle to add the impurity<br>
<span>thank you in advance</span><br>
<span>cordially</span> <span>mouna</span>
<span>Mesbahi<var></var></span></div>
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