YouTube addon not working since yesterday

Hi, I have the same problem I think (since a few days):

YouTube: accessNotConfigured
Project 294899064488 has been scheduled for deletion cannot be used for API calls. Visit https://console.developers.google.com/iam-admin/projects?pendingDeletion=true to undelet the project

When I go to https://console.developers.google.com/… then it displays that content is loading but it never finished the loading … ?

Then I deleted the “access_manager.json” from the OSMC youtube App settings. But it doesnt work.
I don’t know something about “API keys”. What exactly I have to do?

Thanks for any help