Thanks Sam.

I did ignore the error message and run the model free analysis and I got the 
following errors:

Traceback (most recent call last):
  File "/usr/local/relax/gui/analyses/", line 87, in run
  File "/usr/local/relax/gui/analyses/", line 808, in 
  File "/usr/local/relax/auto_analyses/", line 241, in 
  File "/usr/local/relax/auto_analyses/", line 604, in 
  File "/usr/local/relax/prompt/", line 221, in __call__
    self._backend(*new_args, **uf_kargs)
  File "/usr/local/relax/generic_fns/", line 96, in read
    ds.from_xml(file, dir=dirname(file_path), pipe_to=pipes.cdp_name())
  File "/usr/local/relax/data/", line 452, in from_xml
    self[pipe_to].from_xml(pipe_nodes[0], dir=dir, file_version=file_version)
  File "/usr/local/relax/data/", line 255, in from_xml
    self.structure.from_xml(str_nodes[0], dir=dir, id=parser, 
  File "/usr/local/relax/generic_fns/structure/", line 296, in 
    self.structural_data.from_xml(model_nodes, id=id, file_version=file_version)
  File "/usr/local/relax/generic_fns/structure/", line 1223, in 
    self[-1].mol.from_xml(mol_nodes, id=id, file_version=file_version)
  File "/usr/local/relax/generic_fns/structure/", line 1441, in 
    self[-1].from_xml(mol_node, file_version=file_version)
  File "/usr/local/relax/generic_fns/structure/", line 2607, in 
    xml_to_object(mol_node, self, file_version=file_version)
  File "/usr/local/relax/data/", line 277, in xml_to_object
    value[i] = packBytesAsPyFloat(ieee_value[i])
  File "/usr/local/relax/", line 200, in packBytesAsPyFloat
error: pack expected 8 items for packing (got 571)

Can anyone suggest what is the problem ?

Thanks a lot.


From: Mahdi, Sam <>
Sent: Tuesday, February 21, 2017 4:17:08 PM
To: Ashish Sethi
Subject: Re: Error in setting up model free analysis

Hi Ashish,

I am not part of Edwards team, just a normal relax user. The error is simply 
informing you there is no information for hydrogen spins (which there shouldn't 
be), so its fine. It will exclude the hydrogen spin dynamics in its 
computations, so there is nothing to worry about in regards to the error (from 
my experience).


On Mon, Feb 20, 2017 at 8:40 PM, Ashish Sethi 
<<>> wrote:
Dear Edward,

                    Hope this email finds you well !!!

I am a beginner in the field of protein dynamics and I wish to do a model free 
analysis for my protein which is about 72 residues (8.5 kDa). I have calculated 
the standard R1, R2 and NOE (steady state) parameters and also did the reduced 
spectral density mapping.

My question is related to dipolar relaxation settings while setting up the 
model free analysis, so all my files (R1, R2 and NOE) only have 15N spin 
information and if I follow the instructions given in the manual and select 
"@N" and "@H"-- i get an error saying no information available for H spin which 
is obvious. In this case what am I supposed to select ? Apologies for my 


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