Failure with EKF at px4

Hello everyone!
When I fly a hexacopter coaxial model with gazebo (see my previous topic) the terminal prints for me the next warnings, which I don’t understand quite well. Some of you have the same trouble? As far as I know this failure is given by the sensors (and my personal thought is that my model is not relating well the sensors measurements with the six rotors [ I modified the Iris sdf ]). Some of you could help me?

failure EKF

I solved this long time ago. When the drone has a big amount of rotors, be careful placing them. The mistake was in the motors layout, they were not according to the web layout.