Hi all, I'm tring to run the sample of the jquery flexigrid, the sample is here: http://turbogears.org/2.0/docs/main/ToscaWidgets/Cookbook/FlexiGrid.html, but I have get this kind of error when I try to open this page: http://localhost:8080/fetch. the error message is "TypeError: unsupported operand type(s) for -: 'NoneType' and 'int'". where am I made mistake?
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