Construct 2 gives an error message when it uses the tokenat() expression on an element in an array. It seems to only happen in preview mode.
Here's the error.
<img src="http://dl.dropbox.com/u/90875920/TileTest/weirderror.png" border="0">
This game is designed to build a room out of tiles by loading a JSON file.
The error does not seem to affect the room building process.
Room Building CAPX
Load the above CAPX and press 1, 2, 3 in that order to build the room.