Running FSI examples, "undefined value found"

Hi!,
i am trying to run an fluid-structure example with use of the MEMS module, byt anytime i get the error "undefined value found..." for the variable mod1.v_solid.
So i even downloaded the 2d fsi example from the comsol page and changed there only the geometry (i adapted the boundary condition to this new geometry but i took the same type of bc) I again get the above listed error.
I checked the bc several times....
I wonder, because the undefined values for u_solid apper in such a (x,y) coordinate, which is not involved in the domain for linear elastic model. Is that a problem? Or what i am doing wrong? I spent a lot of time with this.


I have another question. It is poissible to split the structural equation (i.e. the linear elastic model) to several step (something like operator splitting)?
I am trying to overcome this using Laplace equations instead of solid mechanics and solve them together with laminar flow and deformed geometry (ALE) . I take segregated solver, hereby i need inputs from one segregated step to different one. By this approach i have a problem with the FSI-interface condition ( i chose "moving wall") u_wall=u_laplace, where u_laplace is a solution from different segregated solver. The segregated solver for laminar flow does not know the variable u_laplace . Solving both problems in one segregated steps, or using coupled solver helps, but this is not, what i want to. How can i store the solution from one segregated solver and use it (for example as boundary, or initial condition) in the next timestep in another segregated solver?

Thanks for your help!