Limitation for Gantt chart to use more than once in the same page

Hello Everyone. I am looking for a solution with Gantt chart which I am using in 8.18.15 version. I already have a working Gantt chart for one set of data in the page. However, I need to achieve showing the chart for 2 more data in the same page.  When I try to give the widget more than once I am facing a client error . Can anyone tell me why I cannot use the widget more than once? What can be the reason and how can I rectify it?  
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