question about the app Data Grid Extension (Flex Headers)

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I don't know why it always tell me:' Error: unable to find grid with nameError: unable to find grid with name XXX'．   
asked
1 answers
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Which Mendix Version are you using? If it’s a newer version, this widget will not work.

The module description says the following:
“ End of live notice: This widget will not longer be me maintained. “
 

As far as I know, this widget is only working up to mendix 7.4 or something around that.

answered