From: Tiglath Moradkhan (
Date: Thu Jan 07 2021 - 19:17:22 CST

To the VMD community

I'm trying to work through the NAMD tutorial, but
I'm unable to run the ubq.png file
% source ubq.png
I get the following error message:
"couldn't read file "ubq.png": no such file or directory".

I don't understand what the issue is because in the command prompt it shows
that I'm in the 1-1 build directory and when I type dir, I can see the
ubq.png file. How do I move to the 1-1 build directory in the Tk console?

I also tried using the automatic psf builder but I get the following error
"couldn't open "1UBQ_autopsf_preformat_glycan.pdb": no such file or
couldn't open "1UBQ_autopsf_preformat_glycan.pdb": no such file or directory
    while executing
"open ${basename}_preformat_glycan.pdb r"
    (procedure "preformat_pdb" line 54)
    invoked from within
"preformat_pdb $currentMol"
    (procedure "::autopsf::aftersels_gui" line 40)
    invoked from within
    invoked from within
" invoke"
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 [list $w invoke]"
    (procedure "tk::ButtonUp" line 24)
    invoked from within
    (command bound to event)"

I'm guessing that if I use the plugin that I have to delete the default
topology files that show up in the topology files section and keep the
required topology file?

As an aside I'm trying to build a lipoprotein particle. Do I have to use
the topology file "top_all27_prot_lipid_na.inp"?

I would be glad for some help.