Thank you for the response, it happens when Initialize or AddPageAndCreate the page during the startup of the app, I really can't get to that page, I don't have more information since I can't reproduce the error.
I appreciate that the code will be too large to post, and/or you can't share it.
Could you just post the initialize sub and B4Xpage_created sub?
Or PM those two subs (zipped if too large). I'll look at it. Perhaps fresh eyes will notice something.