Nullability of type of parameter 'obj' doesn't match overridden member (possibly because of nullability attributes).

The type 'MapMaven.Core.Models.LeaderboardProvider?' cannot be used as type parameter 'TKey' in the generic type or method 'Dictionary<TKey, TValue>'. Nullability of type argument 'MapMaven.Core.Models.LeaderboardProvider?' doesn't match 'notnull' constraint.

The type 'MapMaven.Core.Models.LeaderboardProvider?' cannot be used as type parameter 'TKey' in the generic type or method 'Dictionary<TKey, TValue>'. Nullability of type argument 'MapMaven.Core.Models.LeaderboardProvider?' doesn't match 'notnull' constraint.

The type 'MapMaven.Core.Models.LeaderboardProvider?' cannot be used as type parameter 'TKey' in the generic type or method 'Dictionary<TKey, TValue>'. Nullability of type argument 'MapMaven.Core.Models.LeaderboardProvider?' doesn't match 'notnull' constraint.

The type 'MapMaven.Core.Models.LeaderboardProvider?' cannot be used as type parameter 'TKey' in the generic type or method 'Dictionary<TKey, TValue>'. Nullability of type argument 'MapMaven.Core.Models.LeaderboardProvider?' doesn't match 'notnull' constraint.

Nullability of reference types in return type of 'BehaviorSubject<Playlist?> PlaylistService.SelectedPlaylist.get' doesn't match implicitly implemented member 'BehaviorSubject<Playlist> IPlaylistService.SelectedPlaylist.get'.

Cannot convert null literal to non-nullable reference type.

Non-nullable field '_audioFile' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.

Non-nullable field '_outputDevice' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.