是什么原因导致此问题在Angular 9应用程序中找不到名称错误的控件？

I am working on a "Tasks" aplication in Angular 9 and PHP. I run into this a Cannot find control with name: <controll name> error while trying to pre-populate the update form with data.

该表格如下所示：

<form [formGroup]="updateTask" name="edit_task_form">
  <mat-form-field appearance="standard">
    <mat-label>Title</mat-label>
    <input matInput placeholder="Title" formControlName="title" placeholder="Title">
  </mat-form-field>
  <mat-form-field appearance="standard">
    <mat-label>Short Description</mat-label>
    <input matInput placeholder="Short description" formControlName="short-description" placeholder="Short Description">
  </mat-form-field>
  <mat-form-field appearance="standard">
    <mat-label>Full Description</mat-label>
    <textarea matInput formControlName="full-description" placeholder="Full Description"></textarea>
  </mat-form-field>
  <div class="text-center">
    <button mat-flat-button type="submit" color="accent" [disabled]="updateTask.pristine || updateTask.invalid">Update</button>
  </div>
</form>

在组件中，我有：

taskId: string;
updateTask: FormGroup;
currentTest:any = {};

this._apiService.getTaskInfo().subscribe(res => {
this.Task = res;
let formInfo = this.Task.info; 

formInfo.forEach(function(task, index){
  console.log(task.key + ": " + task.data);
  this.updateTask .get(task.key).setValue(task.data);
}, this)

}）;

The formInfo array Im trying to get the task info from looks like this:

[{
   "taskId":"5eb45c2738ae2549000ddb0a",
   "key":"title",
   "data":"Lorem ipsum dolor"
},
{
   "taskId":"5eb45c2738ae2549000ddb0a",
   "key":"short-description",
   "data":"Lorem ipsum dolor sit amet, consectetur adipisicing elit"
},
{
   "taskId":"5eb45c2738ae2549000ddb0a",
   "key":"full-description",
   "data":"Reprehenderit aperiam unde distinctio, fuga magnam asperiores laboriosam expedita fugiat numquam rerum debitis temporibus dolores."
}] 

The line console.log(task.key + ": " + task.data) correctly outputs:

title: Lorem ipsum dolor
short-description: Lorem ipsum dolor sit amet, consectetur adipisicing elit
full-description: Reprehenderit aperiam unde distinctio, fuga magnam asperiores laboriosam expedita fugiat numquam rerum debitis temporibus dolores.

但是，表单字段未填充数据，并且在控制台中出现错误：

Cannot find control with name: 'title'

and so on, for every object in the formInfo array.

我错过了什么？