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

From: Branko (
Date: Tue Feb 03 2015 - 16:14:32 CST


Simply, try to put parameter file in the same directory where is
NAMD.exe file. To do this check did you have read/write permission,
because newer OS like Win7 can make problems. Otherwise, put parameter
file to other directory, but be sure that you have no spaces in path
'name', for example 'D:/namd_working_dir/par_all27 _prot_lipid.inp.
Also, try to use file with '_prm_' extension for _simulation_. If you
need CHARMM27 parameters, you can download it from:

file: 'toppar_c32b1.tar.gz'


>> Oh, I apologize. That space does not exist in the file name and the
>> three dots exist to show that there was a file path before that.
>> Thank you for the information.
>> Akshata Rudrapatna
>> On Feb 3, 2015 2:33 PM, "David Hardy" <
>> <>> wrote:
>> 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,
>> Dave
>> --
>> 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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