<script src="assets/js/core/app-menu.js"></script>
<script src="assets/js/core/app.js"></script>

mat-datepicker' is not a known element:
1. If 'mat-datepicker' is an Angular component, then verify that it is part    

InvalidOperationException: Unable to resolve service for type 'ServiceLayer.ISecurityTrimmingService' while attempting to activate 'ServiceLayer.DynamicPermissionsAuthorizationHandler'.

public class DynamicPermissionsAuthorizationHandler : AuthorizationHandler<DynamicPermissionRequirement>
    {
        private readonly ISecurityTrimmingService _securityTrimmingService;

        public DynamicPermissionsAuthorizationHandler(ISecurityTrimmingService securityTrimmingService)
        {
            _securityTrimmingService = securityTrimmingService;
            _securityTrimmingService.CheckArgumentIsNull(nameof(_securityTrimmingService));
        }