Can't generate a RealmModel that has a RealmModel parameter

MongoDB Atlas App Services & Realm
,
1 
import 'package:realm/realm.dart';

part 'command.realm.dart';

@RealmModel()
class _Command {
  @PrimaryKey()
  late ObjectId id;
  late String command;
  late String status;
  late DateTime tagab;
}

Hello, I am trying to have a class named UserDatabase that will have a parameter “List commands”. Where the Command class is provided above. After running:dart run realm generate The Command class was generated successfully. Now I am trying to create the UserDatabase class like this:

import 'package:realm/realm.dart';
import 'command.dart';
part 'user_database.realm.dart';

@RealmModel()
class _UserDatabase {
  @PrimaryKey()
  late ObjectId id;

  late String user_id;
  late List<Command> commands;
}

And when running dart run realm generate, I get this output:

5   │ @RealmModel()
6   │ class _UserDatabase {
    │       ━━━━━━━━━━━━━ in realm model for 'UserDatabase'
... │
11  │   late List<Command> commands;
    │        ^^^^^^^^^^^^^ List<InvalidType> is not a realm model type

Where am I wrong? Thank you.

2

I tried changing List to RealmList, but it didn’t work.
Also tried: RealmList<_Command>. And tried to define the command class as $Command but it didn’t do the job