RROR Error: Uncaught (in promise): Error: Template parse errors: Unexpected closing tag "app-config-

错误信息：RROR Error: Uncaught (in promise): Error: Template parse errors:
Unexpected closing tag "app-config-module". It may happen when the tag has already been closed by another tag.

背景：angulr6

错误原因：在html中标签使用不规范。

例如：双引号使用，只有一个。

<app-config-module #tpl"></app-config-module>