Process completed with exit code 1.

Possible null reference return.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

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

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

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

Dereference of a possibly null reference.

Dereference of a possibly null reference.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.