I am doing analysis of centrifugal pump in turbine mode. I meshed model in turbine mode. Then exported in Gambit for boundary conditions. Then read mesh file in fluent and done 3 D analysis. After doing complete analysis I closed fluent. When I start fluent again and read cas and data file it shows error of grid interface. It shows like this:

Building...

mesh

Error: %%create-sliding-interface: wta(sb2-id)

Error Object: sb1-id

materials,

interface,

domains,

mixture

zones,

default-interior:014

default-interior:001

default-interior

inlet

outlet

outlet_pipe_wall

casing_walls

wall

interface_1

interface_2

interface_3

interface_4

Skipping zone wall-18 (not referenced by grid).

Skipping zone wall-19 (not referenced by grid).

wall-21

wall-22

casing

impeller

outlet_pipe

interior-17

interior-20

Error: CDR: invalid argument [1]: wrong type [not a pair]

Error Object: #f