The NG8001 Error happens at ng-build, or ng-serve time when changes are made to things like the import statements, or when adding new modules. Angular - error NG8001: 'mat-step' is not a known element But avoid …. If 'app-nav' is a Web … When testing Angular Components, I often stumble upon the following error message . To Reproduce If 'mat-progress-bar' is an Angular component, then verify that it is part of this module. 2. I hope this article will be of help to anyone who encounters a similar issue. Custom component: is not a known element: - Ionic Forum Normally this includes a stack trace and some more information. error 'ng0304 is not a known element - heagerindia.com how to ask for help politely in message sample Total: $ 0.00. syracuse university agriculture Angular 'router outlet' is not a known element: But don't forget to add a reference to app.module, or else you'll see this. This issue tracker is not suitable for support requests, please repost your issue on StackOverflow using tag angular.. There are two stepper components: mat-horizontal-stepper and mat-vertical-stepper. NG8001: 'fa-icon' is not a known element: 1. Read more about our automatic conversation locking policy.. При выполнении моих юнит-тестов я получаю ошибки типа: ERROR: ''mat-form-field' is not a known element ERROR: ''mat-grid-tile' is not a known element и т.д. If 'app-messages' is an Angular component, then verify that it is part of this module. Unfortunately, not all libraries do a great job at splitting up their code. Angular: error NG8001: 'component' is not a known element Thanks for contributing an answer to Stack Overflow! Assume you want to bundle a folder that has 5 or 6 related components, this is a good time to create a module. Angular: error NG8001: 'mat-select' is not a known element: You seem to be duplicating your imports (you import MatSelectModule in app.module and material.module).. on March 20, 2021 March 20, 2021 by ittone 2 Comments on routes - Angular 11 - RouterModule - 'router-outlet' is not a known element I'm new in Angular, at the moment I working on routing.