Some times, when you call one of your handlers within a ââ?¬Å?tell blockââ?¬Â, it will be redirected to the targeted application and it will try to execute it as part of its commands; so, this will throw an error. To execute your handler, you will need to add an of me reference following your handler call (or use the possesive my). For example:

Applescript:

tell application "Finder"
   -- Do Stuff
   myHandler() of me
   my ownHandler()
end tell