Launch an application from Javascript.

I'm trying to write a simple javascript so that I can launch an application (applescript app) from a PDF. I have found in Adobe Acrobat, that a link that runs Javascript can be a soloution.

Using the script Editor I have this.

var keycheck = Application('/Volumes/CloudStorage/Dropbox/Scripts/Dock Scripts/KeywordChecker.app');

keycheck.activate();

It runs and the keyword app quits, as it should behave. but when running the javascript after it has all ran ok I get the error

Error on line 2: Error: Connection is invalid.

What is happening here and how an I stop this?

Thanks

Matt