Did all that earlier, still received the same error, I'll test it again later.This procedure works for me with 'Unable to load channels':
1. Delete your current MAC and set up a new one. Save.
2. Go to KODI Settings ==> TV==> and Disable
3. go to My Addons ==> PVR Clients ==> Stalker client ===> Disable
4. Configure and change the MAC to the new one you saved. Type OK. Make sure you have entered your Logon/Password value (from your Userid/password)
5. Configure Serial ( twelve numbers and the last digit a letter)
6. Configure Device 1 (any four numbers), Configure Device 2 (any four numbers, but different from Device 1), Configure Signature (your last name)...CLICK ok
7. Enable the Stalker client addon. Do to KODI Settings ==> TV ==> Enable
8. If it still won't loqad, Reboot KODI and see if that works.
Good Luck..