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    On 25/11/2011 7:09 PM, yp sun wrote:
    <blockquote
      cite="mid:1322208567.91302.YahooMailClassic@web15601.mail.cnb.yahoo.com"
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              <div>Dear Sir'</div>
              <div>&nbsp;</div>
              <div>When I ran the grompp as following</div>
              <div>&nbsp;</div>
              <div>grompp -v -f md.mdp -c pr.gro -p RI-10.top -o md.tpr</div>
              <div>&nbsp;</div>
              <div>a error information appeared: </div>
              <div>&nbsp;</div>
              <div><br>
                &nbsp;</div>
              <div>Program grompp, VERSION 3.3.1<br>
                Source code file: readir.c, line: 789</div>
              <div>Fatal error:<br>
                <font style="BACKGROUND-COLOR: #ffff00">Group Ptotein</font>
                not found in indexfile<br>
                Maybe you have non-default goups in your mdp file, while
                not using the '-n' opti on of grompp.<br>
                In that case use the '-n' option</div>
              <div>&nbsp;</div>
              <div>I don't know which file&nbsp;"<font
                  style="BACKGROUND-COLOR: #ffff00">Group Ptotein</font><font
                  style="BACKGROUND-COLOR: #ffffff">" </font><font
                  style="BACKGROUND-COLOR: #ffffff">is in and where I
                  should make change.</font></div>
              <div>&nbsp;</div>
              <div><font style="BACKGROUND-COLOR: #ffffff">Can you help
                  me? Thanks in advance.</font></div>
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    <br>
    You have referred to this group somewhere in your .mdp file,
    probably in error for "Protein". grompp went looking in the index
    file (possibly generated by default) and was confused when it didn't
    find what you told it was there to be found.<br>
    <br>
    Mark<br>
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