Error while using Google Gantt chart

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Hi Everyone, I am getting red colored errror button while using Google gantt chart. I have followed the documentation completely but still getting this error. If anyone used already, kindly help me with this. I am getting the following error below.
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1 answers
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Hello All, 

I am getting similar type of error , Any Idea on how to resolve it.

Thanks,

Aishwarya Kulkarni

 

WidgetGanttChart.png

answered