ERROR in node_modules/@progress/kendo-angular-buttons/dist/es/navigation/navigation-config.d.ts(1,10): error TS2305: Module '".../node_modules/@angular/core/core"' has no exported member 'OpaqueToken'.
It's likely that you're installing a legacy version of the packages from the Progress NPM Registry.
Please, switch to the public npm registry, remove package-lock.json and re-install your packages.