Who is your ISP ?
Are you using a VPN service ?
Sometimes either a full factory reset on your Router or switch off the router at the electrical mains outlet for about 30 minutes may or may not fix this error message if it is showing on all NowTV content you are attempting to watch via the NowTV App on your TV and smartphone.
Try again later message on both tv and mobil I only started the subscription yesterday and had this problem only after a few hours.
I get same thing when I choose (watch something similar) to the type of program I am watching never had it when I started using Now Tv only started about a month ago. But as the Now Tv site mods NEVER seem to answer viewing problems your best choice is chat box.