Only a wild guess. You could try to change the name of the png to lowercase and without any spaces (if there are any).
Try: Change the name to tilemap2.png" and use "/tilemap2.png" to load from URI.
Asmodean Thanks a lot mate it's working Great doing it the way you said, I couldn't find any example on the Manual and all the examples that I found on the forum they were using the external "http://" expression.
Thanks again for that and take care :)