Chroma Hills HD (Realms Plus Texture Pack) can't get activated on a realm

When trying to activate the chroma hills hd texture pack, that is included in the realms plus subscription, it says error occured, and won't ever work. This should be fixed. I mean it's realms plus content and doesn't work with a realm. 

 

Also imagine buying that and it doesn't work on your realm. Totally annoying