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我正在尝试使用角度材质表。我导入了该模块，但出现模板解析错误。HTML：

<mat-table [dataSource]="dataSource">

  <ng-container matColumnDef="name">
    <mat-header-cell *matHeaderCellDef> Name </mat-header-cell>
    <mat-cell *matCellDef="let project">{{project.name}}</mat-cell>
  </ng-container>

  <ng-container matColumnDef="key">
    <mat-header-cell *matHeaderCellDef> Key </mat-header-cell>
    <mat-cell *matCellDef="let project">{{project.Key}}</mat-cell>
  </ng-container>

  <ng-container matColumnDef="reason">
    <mat-header-cell *matHeaderCellDef> reason </mat-header-cell>
    <mat-cell *matCellDef="let project">{{project.reason}}</mat-cell>
  </ng-container>

  <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
  <mat-row *matRowDef="let row; column: displayedColumns;"></mat-row>

</mat-table>

组件中的导入：

import { Component, OnInit } from '@angular/core';
import {Observable} from "rxjs"
import { HttpClient, HttpErrorResponse } from '@angular/common/http';
import { ProjectService } from '../services/project.service';
import { UserService } from '../services/user.service';
import { Subject } from 'rxjs/Subject';
import { …