i have this error : ERROR Error: Uncaught (in promise): Error: The pipe 'async' could not be found!

[chanez2020amk]

i work with angular9 and real time firebase

i don't know where is the problem i tried a lot of things but why dont work

if someone can help me

this is my templet html

`
<tr
*ngFor="let command of commande$ | async">

                            <td>  {{command.payload.val().dateCommande}} </td>
                           </tr>`

the service file

getcommandesList() { return this.db.list(this.dbPath).snapshotChanges(); }

the typeScripte file i inserte this instruction in the constroctor

this.commande$=this.comService.getcommandesList();

[VadimDez]

It seems to me that this has nothing to do with the ngx-order-pipe library