Re: [AMBER] FATAL Error: Atom does not have a type (Cation)

From: Thomas Cheatham <>
Date: Wed, 25 Mar 2020 15:09:54 -0600 (MDT)

> Dear all Amber users,I planned to do simulation of DNA in water. The DNA
> length is 36 bp. However after addition of 2 potassium ion, the input
> file (.inpcrd) was not generated.I get error message from the log
> > saveamberparm wat1 ../input_wat/wat01.prmtop ../input_wat/wat01.inpcrd    
> Checking Unit.
> FATAL:  Atom .R<K 37>.A<K+ 2> does not have a type.
> FATAL:  Atom .R<K 38>.A<K+ 2> does not have a type.

The residue name is K which is not consistent with the libraries (assuming
you did load up some ion parameters) so if ion is in the PDB file, change
the residue name to K+.


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Received on Wed Mar 25 2020 - 14:30:01 PDT
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