I'm getting the same warning message with all the sources I added.
2024-10-29 22:50:17.984083: Starting combination of playlists...
[DEBUG | 2024-10-29 22:50:17,992] - Starting new HTTP connection (1): 127.0.0.1:8089
2024-10-29 22:50:17.994250: WARNING: m3u URL not found for 'DirecTV (TVE)'. Skipping...
[DEBUG | 2024-10-29 22:50:17,995] - Starting new HTTP connection (1): 127.0.0.1:8089
2024-10-29 22:50:17.995509: WARNING: m3u URL not found for 'EPlusTV (Linear Channels)'. Skipping...
[DEBUG | 2024-10-29 22:50:17,995] - Starting new HTTP connection (1): 127.0.0.1:8089
2024-10-29 22:50:17.996207: WARNING: m3u URL not found for 'Frndly TV (Gracenote EPG)'. Skipping...
[DEBUG | 2024-10-29 22:50:17,997] - Starting new HTTP connection (1): 127.0.0.1:8089
2024-10-29 22:50:17.997295: WARNING: m3u URL not found for 'Frndly TV (No Gracenote)'. Skipping...
[DEBUG | 2024-10-29 22:50:17,997] - Starting new HTTP connection (1): 127.0.0.1:8089
2024-10-29 22:50:17.997831: WARNING: m3u URL not found for 'PBS (VLC Bridge)'. Skipping...
2024-10-29 22:50:17.997856: WARNING: No data to compare, skipping adding and removing rows in PlaylistManager_Combinedm3us.csv.
2024-10-29 22:50:17.997956: Finished combination of playlists.
FYI, for each source, I got the URLs from Settings > Sources
: