Angular material docs updated,

+ @angular/material-moment-adapter added to package.json

src/assets/angular-material-examples/form-field-theming/form-field-theming-example.html

@@ -9,6 +9,6 @@
 
     <mat-form-field [color]="options.value.color">
         <input matInput type="number" placeholder="Font size (px)" formControlName="fontSize" min="10">
-        <mat-error *ngIf="options.get('fontSize').invalid">Min size: 10px</mat-error>
+        <mat-error *ngIf="options.get('fontSize')?.invalid">Min size: 10px</mat-error>
     </mat-form-field>
 </form>