Constraint found for variables in different Segregated groups. Try to merge these groups.

I am trying to solve for the emf induced in array of coils placed above an array of magnets orgranised with opposite polarity. Here the magnet array is vibrated in x-direction and coils are stationary. I am using magnetic field and moving mesh as physics.

When I am computing the model for the time dependent study, I am getting the following error message:
Constraint found for variables in different Segregated groups. Try to merge these groups.

I am not able to attach file due to file size. Can anyone please help asap.