MusicManager | MusicManager Android Application to learn lates technologies | Android library

EDIT: Added the whole stack trace

I have an Class "DGuild" with a couple fields in the Table.
I also have an @Transient field which should not appear in the database table.

But since I added the @Transient annotation it crashes with the following error:

I've got a variable (a label which describes a play) within a class that I need to pass around between my views, which I do through the @EnvironmentObject state. When a function (in the same class as the variable) that changes that label gets called by one view the variable is updated in the other views. However, that function is also called by the AppDelegate when a notification is fired. At the moment, I've got the class containing the label declared as a new instance in the AppDelegate, which results in no changes to the variable in the view/struct.

Is it possible to give the AppDeleagte access to the environment object (e.g. through AppDelegate().environmentobject(myClass), if so where?) or is there a better way to do this?

Simplified Code:

Class which contains the playlistLabel and the the function to change the playlist and the label

Using .NET Core 2.1, NPGSQL, Entity Framework and Linux.

From Startups.cs' Configure function, I am calling a function in a dependency injected class that in turn calls another dependency injected class which accesses the DB using Entity Framework + NPGSQL.

Configure Services:

I get the following error when importing gmusicapi in Python 2.7 on a Buildroot Linux system:

I am having some trouble getting my music to stop when I press the back button to return to the main menu. The game crashes 9 times out of 10 and returns a IllegalStateException which I will post below. The music is initialised in the GameScreen and when I try to dispose it in onBackPressed method in GameScreen it crashes. Here is my MusicManager class and the important parts of the GameScreen. Any help would be greatly appreciated!

Ok, so I've posted a few things that I'm doing with this project. I'm still learning. Anyway, my controller when it is calling the view for my update method. I'm getting null for the id parameter. I set a breakpoint on if(id == null) on my ActionResult Edit action, and when I run it; it shows null within the breakpoint autos window. Can someone please tell me why I'm getting null when there is data in my database?

MusicController.cs