Newly created user radio stations will not have their main .dll file generated if you are subscribed to the following mod

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2448824112

Loading Order Mod somehow prevents the creation of the mod (your music pack) main .dll file, so my solutions, after I tested several options, are these:

1. Either give up on Loading Order Mod completely

2. If that is not an option for you, then you can unsubscribe from it then run the game with the music pack installed. The game will create the .dll file, it only has to do it once. After that you can exit and re-subscribe to the Loading Order Mod. You will still get the errors (as CSL Music Mod tries to create those .dll files each time it runs) but you can ignore them and the radio stations should appear in the content manager and work in game. Tested.

3. If you want, you can also take it up to that mod's developer and ask him about why his mod does not let CSL Music Mod to create .dll files for music packs.