Using sendChat in an action button script

Hi, I'm trying to do a simple chat output when a button on the character sheet is clicked : <button type="action" name="act_say">Say something</button> <script type="text/worker"> on('clicked:say', function() { sendChat("Roller", "Youhou"); }); </script> Yet the only thing i have in the console in the end is a  ReferenceError: sendChat is not defined Is there a way to use sendChat there ? Do I neet to access it from another object ?

action buttons cannot send chat messages. They can only change attribute values.  In the same way roll buttons can only send to chat, they cannot change attribute values. Each type of button does only one thing, they cannot be combined. Also sendChat is an API command-  you cant use that in character sheets.