INVALID_STATE_ERR: DOM Exception 11 (WebKit)

Question

I recently tested a Cappuccino app I was working on with Chrome and Safari. I get the error:

INVALID_STATE_ERR: DOM Exception 11: An attempt was made to use an object that is not, or is no longer, usable.

The lack of information is frustrating. What object and where did I attempt to use it? Chrome tries to answer the second question but the line number it gives, 465, doesn't mean anything when the file it gives is just 94 lines long. Without more information I don't even know where to start looking.

Answer 1

First, I don't really know a thing of Cappucino or what you're trying to do. But I've seen this when working with Qt WebKit and JavaScript objects. It happened after javascript window object was cleared, e.g. if I didn't load my native JS objects to WebKit after new page was loaded.

This basically means, you are trying to use internally deleted JavaScript object.

Answer 2

Both Chrome and Safari have built in debuggers. Make sure you use the index-debug.html file to launch your application to get easy to read code.

In Safari, go to Preferences and activate the Developer menu. Then go to Develop > Start Debugging JavaScript. Use the pause icon in the lower left to set the debugger to pause on errors. The next time you hit the problem the debugger will pause at the offending line and show you how it got there through the stack trace.