What are common Angular template error types?

What are some common error types I might encounter in Angular templates?

In Angular templates, you might encounter errors like 'Cannot read property of undefined', 'Expression has changed after it was checked', and 'No provider for X'. Would you like to know more about any specific error?

Can you explain the 'Expression has changed after it was checked' error?

This error occurs when a value changes after Angular has checked it during the change detection cycle. It usually indicates that you're modifying a property in a lifecycle hook like ngOnInit or ngAfterViewInit. To fix it, you can use ChangeDetectorRef or ensure that the value is set before the change detection runs.

What causes the 'Cannot read property of undefined' error?

This error typically happens when you're trying to access a property of an object that hasn't been initialized or is null. Make sure the object is defined before accessing its properties.

How can I debug these template errors effectively?

You can use Angular's built-in debugging tools, such as the Angular DevTools, and also check the console for error messages. Adding console logs can help trace the source of the error.