Blog post/news article

The error message is self explanatory! Blog posts must be BlogPosting.

There is a solution though, which is remove the Blog markup entirely since it’s not valid in this case.

You can use a code like this in your Theme’s functions.php file:

add_filter( 'schema_blog_output', 'schema_blog_output_remove_8987716235' );
/**
 * Remove Schema Plugin markup for Blog on home page
 *
 * @param array $schema
 * @return array 
 */
function schema_blog_output_remove_8987716235( $schema ) {
    
	// Simply return an empty array
	return array(); 
}

Here is a link to the gist where you can get this code snippet.

*Another solution is to get Schema Premium, it has a way to select markup type, you can set markup type to Blog or ItemList. The ItemList allow listing content with different types than Blog Post. Check out the Schemas settings for more details.