关于 angular:Failed: Template parse errors: \\’mat-card-title\\’ is not a known element

Failed: Template parse errors: 'mat-card-title' is not a known element

两个月前我开始使用 Angular，我设计了一个应用程序并进行了 ng 测试，我遇到了这个错误：

失败：模板解析错误：
'mat-card-title' 不是已知元素：
1. 如果"mat-card-title"是一个 Angular 组件，那么验证它是这个模块的一部分。
2. 如果 'mat-card-title' 是一个 Web 组件，则将 'CUSTOM_ELEMENTS_SCHEMA' 添加到该组件的 '@NgModule.schemas' 以禁止显示此消息。
我不明白我的代码中有什么不起作用。

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import { NgModule } from '@angular/core';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { HeroService } from './hero.service';

import { AngularFireAuthModule } from '@angular/fire/auth';
import { AngularFireModule } from '@angular/fire';
import { AngularFirestoreModule } from '@angular/fire/firestore';
import { AngularFireStorageModule } from '@angular/fire/storage';
import { AngularMaterialModule } from './angular-material/angular-material.module';

import { environment } from 'src/environments/environment';

import { FormsModule } from '@angular/forms';

import { ToastrModule } from 'ngx-toastr';

import { HeroesListComponent } from './heroes-list/heroes-list.component';
import { HeroDetailComponent } from './hero-detail/hero-detail.component';
import { HeroSearchComponent } from './hero-search/hero-search.component';
import { HeroTableComponent } from './hero-table/hero-table.component';
import { LoginComponent } from './login/login.component';
import { NavbarHeroesComponent } from './navbar-heroes/navbar-heroes.component';
import { AddHeroesComponent } from './add-heroes/add-heroes.component';
import { HeroGridComponent } from './hero-grid/hero-grid.component';

import { FlexLayoutModule } from '@angular/flex-layout';

@NgModule({
declarations: [
AppComponent,
LoginComponent
],
imports: [
BrowserModule,
AppRoutingModule,
BrowserAnimationsModule,
FormsModule,
AngularFireModule.initializeApp( environment.firebaseConfig ),
AngularFirestoreModule,
FlexLayoutModule,
AngularFireAuthModule,
AngularFireStorageModule,
ToastrModule.forRoot(),
AngularMaterialModule
],
providers: [
HeroService
],
bootstrap: [AppComponent]
})
export class AppModule { }

这是 AngularMaterialModule

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import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
import { CommonModule } from '@angular/common';

import {
MatButtonModule,
MatTableModule,
MatIconModule,
MatFormFieldModule,
MatSelectModule,
MatInputModule,
MatRadioModule,
MatToolbarModule,
MatCardModule,
MatGridListModule,
MatCheckboxModule,
} from '@angular/material';

const moduleAngularMaterial = [
MatButtonModule,
MatIconModule,
MatFormFieldModule,
MatSelectModule,
MatInputModule,
MatTableModule,
MatCheckboxModule,
MatRadioModule,
MatToolbarModule,
MatCardModule,
MatGridListModule
];

@NgModule({
declarations: [
],
imports: [
moduleAngularMaterial,
CommonModule
],
exports: [
moduleAngularMaterial
],
})
export class AngularMaterialModule { }