PVR manager is starting up:
Loading channels from clients
Stalker Authenticating Failed. Retrying
Sorry we cant process this request right now.
yes, it started an hour ago or so...
System is being worked on now
Sounds like you are using a version of Kodi 15. If so, the easiest thing to do is to update to 16.1. I wouldn't take the leap to 17 yet.
Technically, you can downliad and edit the guide to deal with the issue, but you'd have to it every day.