Export to PDF/Excel/MSProject features are not working. Getting following two issues
`Uncaught ReferenceError: gantt is not defined
at api.js:31
at api.js:584
core.js:5828 ERROR TypeError: dhtmlx_gantt__WEBPACK_IMPORTED_MODULE_2__.gantt.exportToPDF is not a function`
Am using Angular 9 & Gantt 7.1.5
Please help me to resolve this error.