Error map
NG01203 Angular: NG01203: No value accessor for form control with name: 'x' (ControlValueAccessor missing)
Angular · layer 1, On your device
Centre: this error. First ring: errors it is linked with (6). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.
Directly related (6)
Angular: NG8002: Can't bind to 'ngModel' since it isn't a known property of 'input'
The template uses a property binding that no imported directive provides — for ngModel, FormsModule isn’t imported.
Angular: NG8003: No directive found with exportAs 'ngForm' (template reference variable)
A template reference such as `#f="ngForm"` points at a directive Angular cannot find on that element — the module that provides i…
Angular: Error: Cannot find control with name: 'email' (reactive forms)
A `formControlName` points at a control that does not exist in the bound `FormGroup`.
Angular: NG01050: formControlName must be used with a parent formGroup directive
`formControlName` is used outside any `[formGroup]` — the control has no form to belong to.
Angular: NG01352: If ngModel is used within a form tag, either the name attribute must be set or the form control must be defined as 'standalone'
An `[(ngModel)]` input sits inside a `` but has no `name`, so Angular cannot register it as a form control.
Angular Material: Error: mat-form-field must contain a MatFormFieldControl
A `` has no Material input inside, or the module that provides `matInput`/`mat-select` is not imported.
Two steps away (9)
Warning: A component is changing an uncontrolled input to be controlled
An input’s `value` started as `undefined` (uncontrolled) and later became a defined value (controlled), or vice versa.
django.template.exceptions.TemplateDoesNotExist: app/page.html
Django searched all template directories and couldn’t find that template.
Contact Form 7: There was an error trying to send your message. Please try again later.
The form submitted, but wp_mail() failed to send — the server can’t send mail or the mail settings are wrong.
Angular: NG8001: 'app-item' is not a known element — verify that it is included in the component's imports
The template uses a tag Angular does not recognise as a component — it was never imported (standalone) or declared/exported (NgMo…
Angular: NG8113: NgIf is not used within the template of AppComponent — unused standalone import
A standalone component lists a directive, pipe or component in `imports` but never uses it in its template.
Angular: NG0301: Export of name 'x' not found! (template variable #x="exportAs")
A template variable asks for a directive by `exportAs` name, but no directive with that export is on the element at runtime.
Angular: NG0100: ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked
A template value changed during the same change-detection cycle in which Angular already checked it (dev-mode only error).
Angular: NG0300: Multiple components match node with tagname app-x: A and B
Two components in scope share the same selector, so Angular cannot decide which one renders for that tag.
Angular SSR: NG0500: During hydration Angular expected <div> but found <span> (NG0501, NG0502)
The HTML rendered on the server does not match what the browser's Angular app tried to render, so hydration failed and the page w…
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