How to make object in extension?

Hello Everyone ! I am new in extension developing. i want to use intent, so that i have to create object of that. i tried to make object in @SimpleProperty but it shows me error “cannot find symbol”. someone please help me out !

for questions about working with the App Inventor sources, please ask in the Open Source Group
https://groups.google.com/forum/#!forum/app-inventor-open-source-dev
Thank you
Taifun