the sort bar of a data grid cannot work and report an error

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Hi,  I'm a beginner developer and have published a free app successfully. Although the app can work, the data grid area fails to show the sort bar. It seems that all other functions are working properly, like editing data, exporting data and showing data. Error detail (not upload data yet ): From time to time, the sort bar shows, I don't know why: Currently, the end-users just use it as it is. I'm stilling looking for a solution, hope someone can help, thx! data grid setting:   my attempts:  (1)  add a data without empty value   (2)  use database instead of Xpath as the source (although in this case export to excel button fails),  the sort bar problem still exist
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1 answers
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The error could be related to the widget you're using at the bottom: Data Grid Extension.

Could you try to run the app without that widget on the page?

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