This happens if you cleared the app data or if the playlist file was deleted from the server. Always backup your playlist URL in a secure note.
Some M3U URLs allow you to change the output format at the end of the link (e.g., &output=ts or &output=hls). tivimate iptv player m3u playlist url work
How to make it work: Edit the end of your M3U URL from &output=ts to &output=hls and reload the playlist. This happens if you cleared the app data
Contact your IPTV provider and ask for the M3U Plus format (preferred) or the standard M3U. It should end with .m3u or contain parameters like ?username= and &password=. How to make it work: Edit the end
Sometimes the M3U loads, but the TV Guide (EPG) does not work, or the app crashes.
Once your M3U URL is loading, you want it to work flawlessly. Here are advanced tips for TiviMate.