Hi George,

Hm, sorry about that. It seems to be saying that the parameter uncertainties weren't calculated correctly. It probably should not even be trying to estimate the uncertainty in the model. I believe it should be fixed in git master for larch, and I'll see about looking for this in lmfit too.

On Mon, Apr 20, 2020 at 4:00 PM George Sterbinsky <GeorgeSterbinsky@u.northwestern.edu> wrote:

Hello,

When attempting to export an xdi file for a pre-edge peak fit in XAS viewer, the error message below prints to the terminal and the xdi file is not generated. I can provide the project file and instructions for generating the error message if that would be helpful.

Thank you,
George

Traceback (most recent call last):
File "/anaconda3/lib/python3.7/site-packages/larch/wxxas/prepeak_panel.py", line 369, in onExportFitResult
yerr=yerr, x=x)
File "/anaconda3/lib/python3.7/site-packages/larch/io/export_modelresult.py", line 60, in export_modelresult
delta_fit = result.eval_uncertainty(result.params, **kwargs)
File "/anaconda3/lib/python3.7/site-packages/lmfit/model.py", line 1488, in eval_uncertainty
dval = pars[pname].stderr/3.0
TypeError: unsupported operand type(s) for /: 'NoneType' and 'float'
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