An enclosing instance that contains <my reference> is required

Solution 1:

You're trying to use the non-static inner positionObj class without an instance of Secretary for it to belong to.
A non-static inner class must belong to an instance of its parent class

You should probably change positionObj to a normal class or a static inner class.

Alternatively, you can write someSecretary.new positionObj() to create an instance of the inner class that belongs to the someSecretary instance.

Solution 2:

First create an object of Outer class. In this case I think "Secretary". Then create positionObj. Like this,

Secretary x = new Secretary();
Secretary.positionObj y = x.new positionObj();