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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 ...
2
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0answers
33 views

Showing WP_Error message with admin_notice action hook

I have just get an answer to one of my question http://wordpress.stackexchange.com/a/189737/1581 but the problem is I want to print a error when ever user will insert tags of more than two words ...