sliding meshes

GU

Hi i'm running a sliding mesh calculation but four of the interfaces cause this message when i'm re-reading the case files:

error access: unbound variable error object: thread type name

at the end of the case reading, it says it's building grid interfaces. the four it builds relate to the four faces that caused the error messages.

the simulation runs fine and i've checked the interface set up, which is identical to the other two dozen or so in the model. Also no problems when solving the mesh motion so there would seem to be no problem except for these messages.

any ideas???

thanks.