FSI Ramping error
 

I am trying to simulate FSI I am facing the error.

System coupling run completed with errors. Transient Structural (Solution 1) reported: Preconditioned conjugate gradient solver error level 1. Possibly, the model is unconstrained or additional iterations may be needed. Try running setting the multiplier MULT on the EQSLV command to greater than 1.0 (but less than 3.0). Please do not save the project if you would like to recover to the last saved state.

An internal solution magnitude limit was exceeded. Please check your Environment for inappropriate load values or insufficient supports. Also check that your mesh has more than 1 element in at least 2 directions if solid brick elements are present. Please see the Troubleshooting section of the Help System for more information.

This means the structural solver diverged. Try running the structural-only case with representative pressure loads and make sure this solves OK.