type ‘Future’ is not a subtype of type ‘() => void’

Your launchURL(blogModel.url) call returns Future, and onTap needs a void.

There are 2 solutions to fix this problem.

1. onTap: () => launchURL(blogModel.url),
   

2. onTap: () {
     launchURL(blogModel.url); // here you can also use async-await
   }