FLUENT无法读入保存后的cas&dat文件，什么原因？

yfling27

我采用滑移网格法模拟搅拌槽内的流场，计算完毕后打开保存的cas&dat文件时，出现如下提示：
uilding...
     grid,
Error: %si-create-grid-interface: wta(int)
Error Object: interface
     materials,
     interface,
     domains,
mixture
     zones,
default-interior:001
default-interior
tank
bottom
shaft
impeller
surface
shang_in
shang_out
zhong_in
zhong_out
xia_in
xia_out
wall-18
wall-19
wall-21
Skipping zone wall-22 (not referenced by grid).
Skipping zone wall-24 (not referenced by grid).
Skipping zone wall-25 (not referenced by grid).
rotor
stator
interior-17
interior-20
interior-23
Error: CDR: invalid argument [1]: wrong type [not a pair]
Error Object: #f
请问这是怎么回事？