[srrietveld bug] could not refine phase fraction

[dif...@diffpy.org]

reporter: brid...@ornl.gov

summary: could not refine phase fraction

description: refinement of most parameters (Hscale/back/lattice parameters) worked well, but upon adding the phase fraction in a two phase refinement, an error appeared (the error log below).

component: srrietveld

version: 1.0beta-r5972-20101104

traceback:
Traceback (most recent call last):
File "C:\SrRietveld\Python26\lib\site-packages\diffpy.srrietveld-1.0beta_r5972_20101104-py2.6.egg\diffpy\srrietveld\gui\errorwrapper.py", line 61, in _f
return func(*args, **kwargs)
File "C:\SrRietveld\Python26\lib\site-packages\diffpy.srrietveld-1.0beta_r5972_20101104-py2.6.egg\diffpy\srrietveld\gui\mainframe.py", line 1248, in onIdle
if job.runSingleStep():
File "C:\SrRietveld\Python26\lib\site-packages\diffpy.srrietveld-1.0beta_r5972_20101104-py2.6.egg\diffpy\srrietveld\job.py", line 149, in runSingleStep
isLastStep = fitrt.run(isStrategyEnabled = GLOBALS.isStrategyEnabled)
File "C:\SrRietveld\Python26\lib\site-packages\diffpy.srrietveld-1.0beta_r5972_20101104-py2.6.egg\diffpy\srrietveld\fitrt.py", line 131, in run
self.refineSingleStep()
File "C:\SrRietveld\Python26\lib\site-packages\diffpy.srrietveld-1.0beta_r5972_20101104-py2.6.egg\diffpy\srrietveld\fitrt.py", line 313, in refineSingleStep
mode = "refine", signature=[sig, '.'])
File "C:\SrRietveld\Python26\lib\site-packages\diffpy.pygsas-1.0b_r5972_20101104-py2.6.egg\diffpy\pygsas\fit.py", line 171, in refine
self.getRefineResult(fitsummary, srtype, expfullname)
File "C:\SrRietveld\Python26\lib\site-packages\diffpy.pygsas-1.0b_r5972_20101104-py2.6.egg\diffpy\pygsas\fit.py", line 245, in getRefineResult
self.updateFit(newfit)
File "C:\SrRietveld\Python26\lib\site-packages\diffpy.pygsas-1.0b_r5972_20101104-py2.6.egg\diffpy\pygsas\fit.py", line 125, in updateFit
constraint.sigma = newconstraint.sigma
AttributeError: 'NoneType' object has no attribute 'sigma'