流固耦合最后一步报错，前面都是绿色对号

报错内容：Update failed for the Solution component in System Coupling. The coupled update for system Transient Structural threw an exception. Error updating cell Solution in system Transient Structural.(DP 0) System coupling run completed with errors. Fluid Flow (Fluent) (Solution) reported: Fluent encountered fatal error after sync point Analysis Initialization :Update_Before_...