In reply to designMaster:
You have a reference like this in your code:
sequencer ss;
If you want to use the type_idd create method you have to define a seperate class for your sequencer and to register this with the factory.
And you have some additional weaknesses in your code. See the corrected code here:
The main point is now you are missing a driver. You are creating currently 1 seq_item. Then your tesbench is stucking and stopping by a timeout.