BrowserModule has already been loaded. If you need access to common directives such as NgIf and NgFor from a lazy loaded module, import CommonModule instead.

错误信息：BrowserModule has already been loaded. If you need access to common directives such as NgIf and NgFor from a lazy loaded module, import CommonModule instead.

 

问题：BrowserModule,  BrowserAnimationsModule,  只需要在appModal导入一次即可

检查项目时候有多次被导入