請問以下的錯誤訊息,可能是什麼原因?

[thomas0728]

Error: ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value: 'undefined'. Current value: 'dialog_body'. It seems like the view has been created after its parent and its children have been dirty checked. Has it been created in a change detection hook ?

setup-dialog.component.html 如下:

<div id="id_content">
           <h1>dffddf</h1>
</div>

<hr>
<div id="id_foot" fxLayoyt="row">
  <button >Delete</button>
  <button >Cancel</button>
  <button >Save</button>
</div>

感激不儘

[thomas0728]

感覺是和 angular 版本有關,在4.31. 有問題,在 4.0.x 就沒問題,只是在 module 裡引入到服務,如 providers:[NgLayer] 就出現錯誤:
Uncaught Error: Unexpected value 'NotFoundComponent' declared by the module 'AppModule'. Please add a @Pipe/@Directive/@component annotation.

[1inus]

no problem in the template html, im checking the problem

[1inus]

and please show me more code - typescript code