I Made IPTV Custom Codded App When I go to Install Using The Dev Portal itGoes Blank When Try to Ins

This sounds like a question about a channel you have developed or are developing.

You've posted to a forum for Roku users, where few, if any, will be able to help. The Developers forums are a couple of doors down the hall: https://community.roku.com/t5/Developers/ct-p/channel-developers