Thanks Justin. Problem is solved.<br><br>.itp file:<br>[ moleculetype ]<br>; Name nrexcl<br>TRS      3<br><br>[ atoms ]<br>;   nr      type  resnr resid  atom  cgnr   charge     mass<br>     1        OA     1  TRS      O1     1   -0.119  15.9994   <br>
     2         H     1  TRS     H13     1    0.032   1.0080   <br>     3       CH2     1  TRS      C1     1    0.087  14.0270   <br>     4      <b>CCL4  </b>   1  TRS       C     2    0.055  12.0110   <br>     5       CH2     1  TRS      C3     2    0.049  14.0270 <br>
..<br><br>.newitp<br>[ moleculetype ]<br>; Name nrexcl<br>TRS      3<br><br>[ atoms ]<br>;   nr      type  resnr resid  atom  cgnr   charge     mass<br>     1        OA     1  TRS      O1     1   -0.119  15.9994   <br>     2         H     1  TRS     H13     1    0.032   1.0080   <br>
     3       CH2     1  TRS      C1     1    0.087  14.0270   <br>     4      <b>CCl4 </b>    1  TRS       C     2    0.055  12.0110   <br>     5       CH2     1  TRS      C3     2    0.049  14.0270 <br>...<br><div class="gmail_quote">
29 Mart 2011 16:41 tarihinde Justin A. Lemkul <span dir="ltr">&lt;<a href="mailto:jalemkul@vt.edu">jalemkul@vt.edu</a>&gt;</span> yazdı:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div class="im"><br>
<br>
ahmet yıldırım wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Then, what should I do?<br>
<br>
</blockquote>
<br></div>
You&#39;ve somehow created a topology that does not conform to the requirements of the force field.  Fix it so that it does.<br>
<br>
-Justin<br>
<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
29 Mart 2011 16:36 tarihinde Justin A. Lemkul &lt;<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a> &lt;mailto:<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a>&gt;&gt; yazdı:<div class="im">
<br>
<br>
<br>
<br>
    ahmet yıldırım wrote:<br>
<br>
        Dear Justin,<br>
<br>
<br>
        There is &quot;CCl4  12.011   ;     carbon in carbontetrachloride<br>
        (solvent)&quot; in the gromos43a1.ff/atomtypes.atp file.<br>
        But I still have the error &quot;Atomtype CCL4 not found&quot;.<br>
<br>
<br>
    Exactly as I said, capitalization is your issue.  CCl4 and CCL4 are<br>
    not the same.<br>
<br>
    -Justin<br>
<br>
        2011/3/29 Justin A. Lemkul &lt;<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a><br></div>
        &lt;mailto:<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a>&gt; &lt;mailto:<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a><div class="im"><br>
        &lt;mailto:<a href="mailto:jalemkul@vt.edu" target="_blank">jalemkul@vt.edu</a>&gt;&gt;&gt;<br>
<br>
<br>
<br>
<br>
           ahmet yıldırım wrote:<br>
<br>
               Dear users,<br>
<br>
               Force field: 43a1<br>
               water model: spc<br>
<br>
               After this command:grompp -f em.mdp -p topol.top -c<br>
        solvated.gro<br>
               -o em.tpr<br>
<br>
               I have the following error:<br>
<br>
               Fatal error:<br>
               Atomtype CCL4 not found<br>
<br>
               What should I do?<br>
<br>
<br>
           Use an appropriate atom type.  The issue is probably<br>
        capitalization<br>
           somewhere, i.e. CCl4 rather than CCL4.  See atomtypes.atp.<br>
<br>
           -Justin<br>
<br>
<br>
               --         Ahmet YILDIRIM<br>
<br>
<br>
           --     ========================================<br>
<br>
           Justin A. Lemkul<br>
           Ph.D. Candidate<br>
           ICTAS Doctoral Scholar<br>
           MILES-IGERT Trainee<br>
           Department of Biochemistry<br>
           Virginia Tech<br>
           Blacksburg, VA<br></div>
           jalemkul[at]<a href="http://vt.edu" target="_blank">vt.edu</a> &lt;<a href="http://vt.edu" target="_blank">http://vt.edu</a>&gt; &lt;<a href="http://vt.edu" target="_blank">http://vt.edu</a>&gt; | (540)<div class="im">
<br>
        231-9080<br>
<br>
           <a href="http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin" target="_blank">http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin</a><br>
<br>
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<br>
<br>
<br>
        --         Ahmet YILDIRIM<br>
<br>
<br>
    --     ========================================<br>
<br>
    Justin A. Lemkul<br>
    Ph.D. Candidate<br>
    ICTAS Doctoral Scholar<br>
    MILES-IGERT Trainee<br>
    Department of Biochemistry<br>
    Virginia Tech<br>
    Blacksburg, VA<br>
    jalemkul[at]<a href="http://vt.edu" target="_blank">vt.edu</a> &lt;<a href="http://vt.edu" target="_blank">http://vt.edu</a>&gt; | (540) 231-9080<br>
    <a href="http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin" target="_blank">http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin</a><br>
<br>
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<br>
-- <br>
Ahmet YILDIRIM<br>
</div></div></blockquote><div><div></div><div class="h5">
<br>
-- <br>
========================================<br>
<br>
Justin A. Lemkul<br>
Ph.D. Candidate<br>
ICTAS Doctoral Scholar<br>
MILES-IGERT Trainee<br>
Department of Biochemistry<br>
Virginia Tech<br>
Blacksburg, VA<br>
jalemkul[at]<a href="http://vt.edu" target="_blank">vt.edu</a> | (540) 231-9080<br>
<a href="http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin" target="_blank">http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin</a><br>
<br>
========================================<br>
-- <br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Ahmet YILDIRIM<br>