Hi all! When i calculate my task , there is always an error called 'vacuum is generated by given data' .I have tried to check out my boundary conditions and initial conditions ,but it doesn't work. I want to check out my meshes .My meshes are generated by gmsh 3.0.6, all the elements are 'A' (tetrahedron) and about 36912. Can you give me some suggestions about my meshes or geometry?Looking forward to your reply!