An unhandled exception occurred while processing the request.

Exception: Call to Node module failed with error: TypeError: Cannot read property 'toLowerCase' of undefined
at new StyleCompatibility (node_modules\@angular\material\material.umd.js:2250:59)
at AppView._View_NavMenuComponent0.createInternal (NavMenuComponent.ngfactory.js:101:35)
at AppView.create (node_modules\@angular\core\bundles\core.umd.js:9419:25)
at AppView._View_AppComponent0.createInternal (AppComponent.ngfactory.js:27:14)
at AppView.create (node_modules\@angular\core\bundles\core.umd.js:9419:25)
at AppView._View_AppComponent_Host0.createInternal (AppComponent_Host.ngfactory.js:17:14)
at AppView.create (node_modules\@angular\core\bundles\core.umd.js:9419:25)
at ComponentFactory.create (node_modules\@angular\core\bundles\core.umd.js:6029:40)
at ApplicationRef_.bootstrap (node_modules\@angular\core\bundles\core.umd.js:7051:44)
at node_modules\@angular\core\bundles\core.umd.js:6960:93