The variable 'e' is declared but never used

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

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

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

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

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

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

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

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