Sorry here is the complete traceback
>>> Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib64/python2.4/lib-tk/Tkinter.py", line 1345, in __call__
return self.func(*args)
File
"/data/prog/ccpnmr/ccpnmr1.0/python/ccpnmr/analysis/CopyChainAssignmentsPopup.py",
line 440, in copyAssignments
duplicateResidueAssignments(residueA,
residueB,experimentChains=experimentChains)
File
"/data/prog/ccpnmr/ccpnmr1.0/python/ccpnmr/analysis/MoleculeBasic.py", line
256, in duplicateResidueAssignments
project = residueA.root
AttributeError: 'NoneType' object has no attribute 'root'
