Re: namd-1: Fatal Error: Unable to Open CHARMM Parameter File

From: David Hardy (
Date: Tue Feb 03 2015 - 15:32:57 CST

Dear Akshata,

It looks like either you did specify the filename incorrectly or that NAMD is not able to find the file relative to whatever it considers to be the current working directory. Your (retyped) error message shows the path incorrectly starting with three dots and the filename with a space in the middle.

Another possibility is that the parameter file was somehow corrupted.

Best regards,

David J. Hardy, Ph.D.
Theoretical and Computational Biophysics
Beckman Institute, University of Illinois
On Feb 3, 2015, at 2:43 PM, Akshata Rudrapatna <> wrote:
> Hello NAMD Community,
> I am new to the NAMD software, and have been working through the tutorials on the website. Unfortunately, I cannot seem to run the tutorial simulation.
> When I run it in a Terminal window, I get the following message: 
> Processor 0 Exiting: Called CmiAbort
> Reason: Fatal Error: Unable To Open CHARMM Parameter File ../common/par_all27 _prot_lipid.inp
> I have tried editing the path in Environment Variables and downloading the file again from the website. I have also checked to make sure the path name is correct and the file is placed in the correct location. The configuration file is properly set-up, as well. I am using the software on a Windows 7 PC.
> Does anyone have any suggestions or tips as to how to resolve this problem?
> I appreciate your time and consideration.
> Thanks,
> Akshata Rudrapatna

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