missing interface between two zone while importing from ICEM to FLUENT
 

I am trying to create mesh in ICEM CFD. In this case, my domain has two zones i.e. water channel (outer) and rotating zone (inner) (see figure attached below). After creating mesh, mesh is transferred to FLUENT.
Two zones are shown in cell zone. But, interface between both the zones is not shown. Only one interface (interface_1) is associated which gives error in mesh checking. Interface-2 is missing which is necessary to create a interface between rotating and stationary body.

Kindly suggest me how to create interface while meshing in ICEM ? Plz help I am stuck in this problem for a long time