Can't select HighMaps as view style

Problem/Motivation

Can't select the HighMaps View Style from the Style Model. Clicking Apply causes a silent fail and does not close the style selector model and an error is logged in the web tools console.

Here is the error in the console:

{
  "message": "\nAn AJAX HTTP error occurred.\nHTTP Result Code: 200\nDebugging information follows.\nPath: /admin/structure/views/ajax/display/district_data_drilldown/default/style\nStatusText: OK\nResponseText: ParseError: syntax error, unexpected 'static' (T_STATIC) in Composer\\Autoload\\includeFile() (line 239 of /var/www/html/web/modules/contrib/charts_highcharts_maps/src/Plugin/views/style/HighMapsPluginStyleChart.php).",
  "name": "AjaxError"
}

Steps to reproduce

Create a view and try to select HighMaps as the view style.
Click Apply
Spinner briefly spins and the goes away and error is logged in web console.

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes