what's wrong with my class?

[Jonathan Villa via Digitalmars-d-learn]

...
import std.experimental.allocator : make, dispose;
import std.experimental.allocator.mallocator : Mallocator;
public synchronized class Session
{
    private:
        ASI parent;
        cUser user;
    public:
        static Session create(ASI _parent, 
accounts.user.id_user_t id_user) @nogc
        {
            return Mallocator.instance.make!Session(_parent, 
id_user);
        }

        this (ASI _parent, uint id_user)
        {
            assert(_parent !is null);
            assert(id_user != 0);
            parent = _parent;
            user = Mallocator.instance.make!cUser(id_user, 
parent.stringManager);
        }

        ~this ()
        {
            Mallocator.instance.dispose(user);
        }
}

trying to build it throws "Don't know how to initialize an object 
of type Session with arguments (ASI, uint)
D:\Dmd\dmd2\windows\bin\..\..\src\phobos\std\experimental\allocator\package.d(455,48):
        instantiated from here: emplace!(Session, ASI, uint)
source\alfred\memory.d(51,52):        instantiated from here: 
make!(Session, shared(Mallocator), ASI, uint)
dmd failed with exit code 1."

Can't you see the constructor arguments? xDDDD
What I'm doing wrong? :<