How to Properly Mesh a Solid Geometry

Hi,

I have created an assembly that has two parts embedded in a larger part (for reference, please see Figure 1D of Giorgi, M., et al., Mechanobiological simulations of prenatal joint morphogenesis. Journal of Biomechanics (2014), http://dx.doi.org/10.1016/j.jbiomech.2014.01.002).

The job always aborts, and I receive an error message for 'ErrElemMissingSection.' After creating a cut view, I noticed that the meshes for all three parts (all tetrahedral) are only applied to the boundary of the instances, which I have made independent. Is there a way I can create the mesh for each part for the entire solid geometry?

Thanks in advance,

Carolyn