I am having the exact same issue. Everything has been working fine for months then suddenly it started with "Indexes must be integers not strings" error followed by authentication error. I have tried several times to reset the IPTV service. It would work for a short while then it would go back to errors. So i did a portal change plus a reset. Same result things work for a short time then errors. So finally I changed my Mac, portal, and did iptv reset all at the same time. SAME THING works for a short while then back to authentication error. This is getting so frustrating. Just renewed and have 350 days left on the donation. Not sure what kind of machine the OP is using, but I am using Kodi Jarvis with the IPTV Stalker PLUS video addon (newest version)