Running your case, I also get the same issue.
Can you run the perpendicular flap tutorial fluid-openfoam case, configuring with RBFMeshMotionSolver, as Philip describes here?
I guess one aspect we have not checked is whether simpleFoam works at all (it should), as we mostly use pimpleFoam in our FSI tutorials.
You are right, as we have not yet released a new version of the tutorials (but the website points to “develop”, which can be misleading in situations like this). Just go to the develop branch: GitHub - precice/tutorials at develop