NotAllowedError: Security settings prevent access to this property or method.

I am completely new to JavaScript and have been playing about with some code. I entered in the following from 'PDF Document Browser
By Thom Parker, WindJack Solutions, Inc.'

app.getPath("app", "javascript");

On the document I entered this into, I had already set up a pop up menu button which showed a list of attached files. Previous to me entering in the above code, the pop up menu worked fine and would open the selected file. Now however, I am getting the following error message:

Acrobat JavaScript Debugger Functions Version 10.0
Acrobat EScript Built-in Functions Version 10.0
Acrobat SOAP 10.0

NotAllowedError: Security settings prevent access to this property or method.
App.openDoc:2:Field Button1:Mouse Up

NotAllowedError: Security settings prevent access to this property or method.
App.openDoc:2:AcroForm:Button1:Annot1:MouseUp:Action1

NotAllowedError: Security settings prevent access to this property or method.
App.openDoc:2:AcroForm:Button1:Annot1:MouseUp:Action1

I have tried the Restore option under the PDF file attachments in the Trust Manager but this seems to be making no difference at all.

Can you please help?
Thanks

Amy Taylor