I am new to this only recently just following the tutorials.

I am trying to connect the end node of a 3D wire made from beam elements to a flat surface of a solid 3D cuboid. 

I have used MPC in the constraint part of the tree and chosen my end node of the wire and then chosen the slave surface (where the end node is on that same plane).

When I submit I get an error;

***WARNING: MPCS (EXTERNAL or INTERNAL, including those generated from rigid body definitions), KINEMATIC COUPLINGS, AND/OR EQUATIONS WILL ACTIVATE ADDITIONAL DEGREES OF FREEDOM

Could anyone help me on this? Could it be with creating a Connector Section?

Thanks folks!