If you see the message, "Your YouTube channel has content but has been disabled" in your Video Manager, then your channel is hidden and your videos and other content are currently not viewable to other people. 

This may have happened because you chose to hide your channel through Google Account settings.

You can still watch, like, and subscribe, and that activity will be fully private. If you want to make your content viewable to others, or if you want to upload, comment, or use playlists, you'll need to enable the channel.

How to enable your channel and unhide content

1. Sign in to YouTube.
2. Go to create a channel and fill out the form. This will restore your YouTube channel. 
   • In the form, don't click "To use a business or other name, click here." This will create a new channel instead of restoring your hidden channel.
3. After you re-create your public channel, you'll then have the option to make your videos and playlists viewable in the Video Manager.

* Nguồn: Youtube