[gmx-users] help

玻耳兹曼 2719217002 at qq.com
Mon Oct 20 15:24:00 CEST 2014

dear all

I  am new in gromacs .I got an error while running the tutorial of  KALP15 in DPPC . I issue  a command ;
grompp -f minim.mdp -c dppc128.gro -p topol_dppc.top -o em.tpr  , and i received a fatal error :

Back Off! ....
Generated 837 of the 2346 non-bonded parameter combinations

ERROR 1 [file dppc.itp, line 112]:
  No default LJ-14 types

ERROR 2 [file dppc.itp, line 113]:
  No default LJ-14 types
ERROR 28 [file dppc.itp, line 139]
  No default LJ-14 types
ERROR 29 [file dppc.itp, line 140]
  No default LJ-14 types

Fatal error:
There were 29 errors in input file
For more information and tips for troubleshooting, please check the GROMACS
website at http://www.gromacs.org/Documentation/Errors

what can i do.‍

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