Flutter php mysql complete blog app with admin panel part-3

Complete flutter php mysql blog app with admin panel.

[sikanderalii]

Hii Brother
why im facing error on this part??
onTap: (){

Navigator.push(context,
MaterialPageRoute(builder: (context)=> PostDetails(
title:widget.title,
image:widget.image,
author:widget.author,
body:widget.body,
postDate:widget.postdate,
),

)
);
}, and also share the source code