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angular - Template parse errors: 'mat-icon' is not a known element

I'm working with Angular CLI and angular material v.5.2.5 and trying to use

mat-icon-button

but such an error produced by the console:

Uncaught Error: Template parse errors: 'mat-icon' is not a known element...

if I use

mat-raised-button

everything works fine cannot figure out how to solve that

index.html

 <!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Todo</title>
  <base href="/">

  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700,400italic"
    rel="stylesheet">
  <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
</head>
<body>
  <app-root></app-root>
</body>
</html>

main.ts

 import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';
import { environment } from './environments/environment';

if (environment.production) {
  enableProdMode();
}

platformBrowserDynamic().bootstrapModule(AppModule)
  .catch(err => console.log(err));

app.module.ts

 import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { MatButtonModule } from '@angular/material/button';


import { AppComponent } from './app.component';


@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    MatButtonModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }
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by (71.8m points)

The MatIconModule is missing from your imports.

imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    MatButtonModule,
    MatIconModule, // <-- here
],

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