How to show an error message after publishing a post?

I’m using the transition_post_status hook to perform some operations after publishing a post. In some conditions I would like to show an error message in a red box under “Edit Post” and above “Post published”:

Post pushlished

How can I do that?

Solutions Collecting From Web of "How to show an error message after publishing a post?"

I wouldn’t use that hook. Here’s why

Try something like this using admin_notices.

function wpsites_admin_notice() {
$screen = get_current_screen();
if( 'post' == $screen->post_type
&& 'edit' == $screen->base ){
?>
<div class="error">
    <p><?php _e( 'Updated Demo Message!', 'wpsites' ); ?></p>
</div>
<?php
}}
add_action( 'admin_notices', 'wpsites_admin_notice' );

Untested.

add_settings_error(
    'myUniqueIdentifyer',
    esc_attr( 'settings_updated' ),
    $message,
    $type
);

Check

http://codex.wordpress.org/Function_Reference/add_settings_error