Cappuccino cryptic [undefined] errors

i get this kind of error in cappuccino

TypeError: Result of expression '_2b' [undefined] is not an object.
TypeError: Result of expression '_40' [undefined] is not an object.

I can't think of what they could be for as they don't specify a line number.

any ideas?

Like you mentioned, you should load your application using index-debug.html while testing. Furthermore you can use Safari's developer tools to break on errors by clicking on the stop sign shaped "pause" button at the bottom of the Javascript debugger. This is helpful if the error message shows up inside of an Objective-J main file and you need to look at the full stack trace to figure it out.

i didn't realise the index-debug.html which will give me better errors.