i've tried to run the simulation on sliding mesh in Fluent but when i try to initialize, there's warning about unassigned interface zones.how can i solve this problem?please help me..thank you.

Define->Grid Interfaces

Make sure you've assigned a grid interface (in Fluent) for each set of BCs you have defined as interface. You originally defined them in your meshing package (Gambit?), now you just have to tell Fluent that your interface is between Interface.A and Interface.B.

Hope this helps, and good luck, Jason