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I work on angular 9 I face issue when add angular material auto complete text box

error NG8003: No directive found with exportAs 'matAutocomplete'.
 <mat-autocomplete #auto="matAutocomplete" [panelWidth]="auto" (optionSelected)='getchangedoption($event.option.value)'>

      <mat-autocomplete #auto="matAutocomplete" [panelWidth]="auto" (optionSelected)='getchangedoption($event.option.value)'>

auto complete component.html

<mat-form-field >
  <input type="text" placeholder="Select Item" aria-label="Number" matInput [formControl]="myControl" [matAutocomplete]="auto" class="form-control" [(ngModel)]="selectedItemName">
  <mat-autocomplete #auto="matAutocomplete" [panelWidth]="auto" (optionSelected)='getchangedoption($event.option.value)'>
    <mat-option (click)="getselected(exp.itemName,i+1," *ngFor="let exp of this.filteredOptions | async;let i = index" [value]="exp.itemName">

current Packages Exist on angular project is :

"@agm/core": "^1.1.0",
    "@amcharts/amcharts4": "^4.9.26",
    "@amcharts/amcharts4-geodata": "^4.1.15",
    "@angular/animations": "^9.1.13",
    "@angular/cdk": "^12.1.1",
    "@angular/common": "~9.0.0",
    "@angular/compiler": "~9.0.0",
    "@angular/core": "~9.0.0",
    "@angular/forms": "~9.0.0",
    "@angular/localize": "^9.0.0",
    "@angular/material": "^11.2.13"

so How to solve this issue please ?

What I have tried:

I try to add lines below to app.module to solve issue but issue still exist

import { MatAutocompleteModule } from '@angular/material/autocomplete';
import { MatFormFieldModule } from '@angular/material/form-field';
 imports: [

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