I am working on a FSI simulation. When I connect (Image 1) transient structural setup to system coupling set up to update (Image 2) & initiate simulation below error pops up

Update failed for the Setup component in Transient Structural. Unable to save the Mechanical database for component Model in system Transient Structural (A:\Work\BC2_files\dp0\global\MECH\SYS.mechdb).