Error initializing Shape Class

[leointeractives]

Getting an error on
Shape.prototype.initialize.call(this, null);
Error being :
Uncaught TypeError: Cannot read property 'call' of undefined
at Tile$initialize [as initialize] (app.bundle.js:80)
at Tile (eval at createSubclass (app.bundle.js:171), <anonymous>:1:45)
at createSubclass (app.bundle.js:173)
at Object.4../Tile (app.bundle.js:55)
at s (app.bundle.js:1)
at app.bundle.js:1
at Object.7../Block (app.bundle.js:112)
at s (app.bundle.js:1)
at e (app.bundle.js:1)
at app.bundle.js:1

Using EaselJS Version 0.8.0

[JonathanWatkins]

I had to use version 0.7.1 of EaselJS to get this working. I think the Shape class has changed implementation in version 8.