Why <ion-button> is not working in ionic 5 with sidemenu framework

I have created a new ionic app with sidemenu.

But now im trying to add tag, but its not working. The error is below

Error: Template parse errors:
‘ion-button’ is not a known element:

  1. If ‘ion-button’ is an Angular component, then verify that it is part of this module.
  2. If ‘ion-button’ is a Web Component then add ‘CUSTOM_ELEMENTS_SCHEMA’ to the ‘@NgModule.schemas’ of this component to suppress this message. ("

Could you please help me

You are likely missing an import in app.module.ts (ionicmodule)

Thanks, but i imported even though i got this error.

And the module related to the component? Include formsmodule too?

Thank you Tommertom.