Highcharts error #16 is due to duplicate Highcharts definitions. The reason for this error is that the namespace of Highcharts is duplicated.

The namespace of Highcharts actually exists in the Highcharts.js file that we refer to when we use Highcharts.

Solution
Remove the Highcharts.js from the nested subpages and leave only the reference to the main page, and the error will not be reported.

Conclusion
Referencing Highcharts.js on the main page and referencing Highcharts.js on the sub-page nested in it will cause duplicate Highcharts definitions whenever the sub-page is loaded.

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