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Dear gmx users,<BR>
I try to generate gro and top files using pdb2gmx, and this procedure finishs without any error. However, when I run grompp from these files, many errors are encountered such as: <BR>
......<BR>
<EM>ERROR 124 [file g04.top, line 20027]</EM><BR>
<EM> No default Ryckaert-Bell. types</EM><BR>
......<BR>
I gusess it is dihedrals that cause these errors. So I look for the line 20027 in the file g04.top. only to find that these dihedrals are C-N-H-H, obviously wrong. How to avoid these errors? Could you give me some help to cope with them? Thank you for attention.<BR>
<BR>
Sincerely,<BR>
Chaofu Wu<BR>
<BR>
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