模块@ angular / material / material没有导出成员’MdButtonModule’.

打字稿代码：

import { MdButtonModule } from '@angular/material';

发生了什么？

ERROR in c:/dev/my-proj/src/app/app-material/app-material.module.ts
(4,3): Module
‘”c:/dev/my-proj/node_modules/@angular/material/material”‘ has no
exported member ‘MdButtonModule’. ERROR in
c:/dev/my-proj/src/app/app-material/app-material.module.ts (5,3):
Module ‘”c:/dev/my-proj/node_modules/@angular/material/material”‘ has
no exported member ‘MdCardModule’. ERROR in
c:/dev/my-proj/src/app/app-material/app-material.module.ts (6,3):
Module ‘”c:/dev/my-proj/node_modules/@angular/material/material”‘ has
no exported member ‘MdCheckBoxModule’. ERROR in
c:/dev/my-proj/src/app/app-material/app-material.module.ts (7,3):
Module ‘”c:/dev/my-proj/node_modules/@angular/material/material”‘ has
no exported member ‘MdIconModule’. ERROR in
c:/dev/my-proj/src/app/app-material/app-material.module.ts (8,3):
Module ‘”c:/dev/my-proj/node_modules/@angular/material/material”‘ has
no exported member ‘MdOptionModule’. ERROR in
c:/dev/my-proj/src/app/app-material/app-material.module.ts (9,3):
Module ‘”c:/dev/my-proj/node_modules/@angular/material/material”‘ has
no exported member ‘MdProgressSpinnerModule’. ERROR in
c:/dev/my-proj/src/app/app-material/app-material.module.ts (10,3):
Module ‘”c:/dev/my-proj/node_modules/@angular/material/material”‘ has
no exported member ‘MdSelectModule’. ERROR in
c:/dev/my-proj/src/app/app-material/app-material.module.ts (11,3):
Module ‘”c:/dev/my-proj/node_modules/@angular/material/material”‘ has
no exported member ‘MdSidenavModule’. ERROR in
c:/dev/my-proj/src/app/app-material/app-material.module.ts (12,3):
Module ‘”c:/dev/my-proj/node_modules/@angular/material/material”‘ has
no exported member ‘MdToolbarModule’. ERROR in Error: MdButtonModule
is not an NgModule
at _getNgModuleMetadata (c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:140:15)
at _extractLazyRoutesFromStaticModule (c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:109:26)
at c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:129:27
at Array.reduce (native)
at _extractLazyRoutesFromStaticModule (c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:128:10)
at c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:129:27
at Array.reduce (native)
at _extractLazyRoutesFromStaticModule (c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:128:10)
at Object.listLazyRoutesOfModule (c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_impl.js:53:22)
at Function.NgTools_InternalApi_NG_2.listLazyRoutes (c:\dev\my-proj\node_modules\@angular\compiler-cli\src\ngtools_api.js:91:39)
at AotPlugin._getLazyRoutesFromNgtools (c:\dev\my-proj\node_modules\@ngtools\webpack\src\plugin.js:207:44)
at _donePromise.Promise.resolve.then.then.then.then.then (c:\dev\my-proj\node_modules\@ngtools\webpack\src\plugin.js:443:24)