Angular5 form form validation

ngOnInit () {

this.form = new FormGroup({
  email: new FormControl("email@163.com", [Validators.required]),
  password: new FormControl()
});

expected effect
clipboard.png

didn"t show up.
also reports an error

         <mat-form-field class="full-width" >
          <input matInput type="text"  placeholder="Email" formControlName="email" value="">
        </mat-form-field>
Mar.03,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1eb141c-48121.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eb141c-48121.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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