[gmx-developers] Charmm27 and RNA gives No default Angle types errors

Daniel Larsson larsson at xray.bmc.uu.se
Thu Jul 8 13:05:05 CEST 2010

On Jul 8, 2010, at 12:46 , Daniel Larsson wrote:

> Hi all,
> Is the nucleic acid support still under development? I tried to process a small RNA molecule with the latest head version of Gromacs. pdb2gmx is fine, but grompp chokes when building the topology since it can not find any angle parameters and gives one of these errors for each angle:
> ERROR 1 [file topol.top, line 479]:
>  No default Angle types

After some digging, the problem seems to be that the function type set by pdb2gmx is 1 (default), but the ffnabon.itp file lists all the angles as function type 5.

The angletype is set to 5 in the [ bondedtypes ] record in aminoacids.itp, but somehow pdb2gmx does not seem to adhere to this.

> Regards,
> Daniel
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