** ERROR 702660 ** Conformal cooling is not supported in Cool. Cool (FEM) supports conformal cooling. If possible, model the Channel (3D) elements as one dimensional Channel elements. Alternatively, use Cool (FEM).
To run an analysis with the Cool solver, your cooling channels must include beam elements, not tetrahedral elements. Your cooling system has been meshed with a 3D mesh, which will not run with the Cool solver.