角度误差没有意义

Question

我正在尝试使用angular创建一个编辑表单，由于某种原因[ngModel]不断给我一个错误，尽管它读取值并显示它。对行为感到困惑（对角度和学习很新）

下面是我的代码：

1）HTML

    <div class="col-sm-8 col-sm-offset-2 col-md-6 col-md-offset-3">
    <div class="panel-heading">
        {{title}}
      </div>
      <form #editProject = "ngForm" (ngSubmit)="onSubmit(f)">
        <div class="form">
            <div class="form-group">
                <label for="projectName">Project Name</label>
                <input id="p_Name" type="text" name="project_name" class="form-control" 
                placeholder="Project Name" [(ngModel)]= "project.projectName" [ngModelOptions]="{standalone: true}"/>
            </div>
            <div class="button">
                  <button class="btn btn-primary" (click)="updateProject()">Update</button>
            </div>
        </div>    
      </form>
  </div>  

2）TS文件：

import { Component,  Input, OnInit, Output, EventEmitter } from '@angular/core';
import {Project} from '../../models/project';
import {ProjectService} from '../../services/project.service';
import { FormGroup,  FormControl, FormBuilder,  Validators, FormsModule, ReactiveFormsModule } from '@angular/forms';
import { ActivatedRoute, Router } from '@angular/router';
import 'rxjs/add/operator/map';
@Component({
  selector: 'app-edit',
  templateUrl: './edit.component.html',
  styleUrls: ['./edit.component.css']
})
export class EditComponent implements OnInit {
  public project: any;
  public projectForm: FormGroup;
  title = 'Edit Project';
  editProject: Project;
  isLoading = true;
  isSaving = false;
  i: any;  
  constructor(private route: ActivatedRoute, private router: Router, private projectService: ProjectService, private fb: FormBuilder) {

  }

  ngOnInit() {
    console.log(this.route.params);
    this.route.params.subscribe(params => {this.i = +params['id']; });

    this.projectService.getProjectById(this.i)
    //.map(responseData => {this.project = responseData;})
    .subscribe(responseData => {      
      this.project = responseData;            
      console.log(this.project);
      this.isLoading = false;

    });    
  }

3）输出：

[显示结果“数据库”但也给出错误]