ErroNG0203

Boa tarde,

Venho por meio desse fórum ajuda pra verificar um erro que estou tendo em relação a uma página que estou fazendo; Uma página está com "error: NG0203: inject() must be called from an injection context such as a constructor, a factory function, a field initializer, or a function used with runInInjectionContext." como ná imagem abaixo

Meu auth.service.ts:

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Account } from '../account.model';


@Injectable({
  providedIn: 'root'
})
export class AuthService {

  constructor(private http: HttpClient){}
  apiURL= 'http://localhost:3000/contas/signup';

  logAccount(){
      return this.http.get(this.apiURL);
  }

  registerAccount(account: Account){
      return this.http.post(this.apiURL, account);
  }


}

E o component responsavel pela pagina de cadastro:

import { Component, OnInit } from '@angular/core';
import { FormControl, FormGroup, Validators } from '@angular/forms';
import { ToastrService } from 'ngx-toastr';

import { Account } from '../../services/account.model';


import { Router } from '@angular/router';
import { AuthService } from 'src/app/services/services/auth.service';

@Component({
  selector: 'app-new-account',
  templateUrl: './new-account.component.html',
  styleUrls: ['./new-account.component.css']
})
export class NewAccountComponent implements OnInit{


  public registerForm: FormGroup = new FormGroup({
    'fullName': new FormControl('', Validators.minLength(5)),
    'email': new FormControl('', Validators.email),
    'CPF': new FormControl('', Validators.maxLength(11)),
    'date': new FormControl('', Validators.required),
    'password': new FormControl('', Validators.maxLength(6)),
  })

  constructor( private auth: AuthService, 
               private toastr: ToastrService, 
               private router: Router){}


  ngOnInit() {

  }

  public registerAccount(): void{
    let newAccount: Account = new Account(
      this.registerForm.value.fullName,
      this.registerForm.value.email,
      this.registerForm.value.CPF,
      this.registerForm.value.date,
      this.registerForm.value.password,
    )

    this.auth.registerAccount(newAccount);{
      if(this.registerForm.valid){
        this.auth.registerAccount(this.registerForm.value).subscribe(res=>{
           this.toastr.success('Cadastrado com sucesso');
           this.router.navigate(['login']);
        });
      }else{
        this.toastr.warning('Por favor insira os dados corretos')
      }
    }
  }
}

Estou batendo a cabeça um cota e já não seu o que fazer, agradeço a atenção adiantada;