Hi everyone！

I am a newbie using preCICE. I am trying to implement a simple 2D wing simulation by changing the perpendicular-flap case in the tutorial, referring to the OpenFOAM tutorial Turbulent flow over NACA0012 airfoil (2D) and assume that the Solid-part front-end is fixed for the FSI simulation.

The results do not to be converging

```
---[precice] ERROR: Attempting to add a zero vector to the quasi-Newton V matrix. This means that the residuals in two consecutive iterations are identical. If a relative convergence limit was selected, consider increasing the convergence threshold.
```

Do I have any missing or improper settings?

I have attached the file I set up here Cases

I am stuck and any help would be really appreciated

Best regards,

Jeff

P.S. I am running preCICE version 2.5.0