So far your post suggests that you are using the built in Kodi Live TV feature in conjunction with PVR Stalker Client, but in order to get help you're going to have to supply more information than simply the channels won't work.
Info such as what device you're using, what version of Kodi you're running, is your IPTV Stalker Video Addon loading channels, what version of PVR stalker Client you're having the problems with, is your MAC in the format of 00:1A:78:XX:XX:XX, whether your active donation is for NFPS, Rocket or IKS66 would help others to help you.