Tilemap problem? -1 tile?

Hi everybody, I start to use a tilemap to make a maps...

I have different tile with different collision (for the angle of the player) when the event need to set the angle to 0 is not working... and the tile number will be -1?

this is the example

I don't understand why is not working with the tile number 20... the other tile works!!

thank you very much

I solve this problem:

AJAX, request project --> jsonfile

load tilemap from ---> AJAX.LastData

somebody know if this method will work with the iphone?

thank you