hi I m trying to model a blast wave impact on a structure using FSI approached (Ansys Fluent-Mechanical)

I m getting this error message which i can seems to resolve at the current moment:

System coupling run completed with errors. Fluid Flow (Fluent) (Solution 1) reported: Exception encountered when the coupling service requested SyncProcess->AssignToken: Communication socket unexpectedly disconnected. Please do not save the project if you would like to recover to the last saved state.

Appreciate any help given

Regards,Risby