How to handle Angular error message ERROR Error NullInjectorError No provider for XX

Error message

ERROR Error: NullInjectorError: No provider for CustomI18nConfigInitializer! How should it be handled?

I have written the following code in AppModule:

{ 
      provide: CONFIG_INITIALIZER,
      useExisting: CustomI18nConfigInitializer,
      multi: true
    }

Solution

In Angular applications, an ERROR Error NullInjectorError No provider for XX error usually indicates that the required dependencies are not provided in the injector.

Specifically, this error message means that a component, directive, service, etc. need to rely on an object of type XX, but the injector cannot find the provider of XX.

Here are some possible ways to fix this error:

• Add a provider: Add a provider to components, directives, services, etc. that use dependencies that can provide an instance of XX. For example, if the dependency is a service, you can add a provider to the injector metadata for that service:

import { Injectable } from '@angular/core';
import { XX } from './xx';
@Injectable({
  providedIn: 'root',
  // Add a provider  providers: [XX]
})
export class MyService {
  constructor(private xx: XX) { }
}

• Import provider: If the provider already exists but is not imported into the current file, you can solve the problem by importing the provider:

import { Component } from '@angular/core';
import { XX } from './xx';
@Component({
  selector: 'my-component',
  template: `<h1>My Component</h1>`
  // Import provider  providers: [XX]
})
export class MyComponent {
  constructor(private xx: XX) { }
}

• Confirm provider: Make sure that a provider of type XX has been correctly added to the application's module, component, or directive, and its name is spelled and pathed correctly.
• Confirm dependencies: Make sure that components, directives, services, etc. that use XX in the code have been correctly injected into the places where XX is needed.

These methods can help you resolve the ERROR Error NullInjectorError No provider for XX error. If the problem is still not solved, consider looking at other code for the application, or try searching for related solutions on search engines.

The above is the detailed content of how to handle Angular error message ERROR Error NullInjectorError No provider for XX. For more information about Angular error message processing, please follow my other related articles!