fsi problem
 

i have modeled an artery bifurcation in ansys and cfx(fluid flow)
and i have coupled them because i want to use fsi.
but this error has occured:
ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| cplg_SendCommand failed to send the command: ERROR -- CFX encount- |
| ered the error: Read. Fatal error occurred when requesting Total |
| Mesh Displacement for fsi.

fsi is my boundary condition for fluid walls.
what should i do?