1. 确保您的模板中使用了以下代码：

  
  
    
      {{ item }}
    
  

2. 确保您已在应用程序模块中导入了以下模块：

import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { MatAutocompleteModule } from '@angular/material/autocomplete';

3. 如果上述步骤都没有解决问题，请尝试使用以下代码替换您的组件中的代码：

import {Component, OnInit} from '@angular/core';
import {FormControl} from '@angular/forms';
import {Observable} from 'rxjs';
import {map, startWith} from 'rxjs/operators';

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

  myControl = new FormControl();
  options: string[] = ['One', 'Two', 'Three'];
  filteredOptions: Observable;

  ngOnInit() {
    this.filteredOptions = this.myControl.valueChanges.pipe(
        startWith(''),
        map(value => this._filter(value))
      );
  }

  private _filter(value: string): string[] {
    const filterValue = value.toLowerCase();

    return this.options.filter(option => option.toLowerCase().includes(filterValue));
  }
}

希望这些解决方案能够解决您的问题。