"The unnumbered spin name 'H' already exists." -- January 31, 2013 - 16:13

Hi Edward,

I have a strange problem (relax 2.1.2 @ Mac/Linux):

* create a data pipe inside relax (pipe.create)
* get 1OGT.pdb and load by
  > structure.read_pdb('./1OGT.pdb', read_mol=1)
* load amide nitrogens:
  > structure.load_spins(spin_id='@N', ave_pos=True)
* attach protons
  > sequence.attach_protons()

Now I get a very strange error message: 
"RelaxError: The unnumbered spin name 'H' already exists."

But I didn't load a single proton before and there also is none in the PDB 
file? 

What do you think, what is going on? 

Kind Regards,
Martin