interaction valve-blood

Hi! i've to simulate the interaction between an aortic valve and the blood (i use comsol 3.4). I've a pipe with two leaflets fixed with a hinge.
These are what i've imposed:
incompressible navier stockes
subdomain setting:1=fluid domain, init=>p2(to)=100mmHg
2,3=solid domain
boundary settings:1=inlet, velocity, U=0.26m/s;
12=outlet, no viscous stress Po=0;
other=wall,no sleep
plane strain
subdomain setting:1=fluid domain
2,3=solid domain
boundary settings:4-11=fluid load
point setting:7,8=constrained
moving mesh
subdomain setting:1=fluid domain
2,3=solid domain
boundary settings:1,2,3,12=fixed
other=structural displacement
I solve with stationary segregated. During the simulation this error appears:
Failed to find a solution:
In segregated group 2: The relative error is greater than the relative tolerance.
Returned solution has not converged.
Can someone point me what I do wrong???