Different types of elements in meshing and their use: COMSOL Blog

An informative blog on different types of meshes and their uses in 3D Meshing

http://www.comsol.co.in/blogs/meshing-your-geometry-various-element-types/

Identifying the ErrElemMissingSection elements

When the error ErrElemMissingSection pops up, the Visualization module can be used to identify the elements to which this error is attributed. The Abaqus processor writes the error sets to the ODB, which can be accessed in the Visualization module.

To view the elements:

1. Double click the Display Groups in the Results tree.
2. In Create Display Group dialog box, select the Item Elements
3. In Method, select Element sets
4. The elements set would be shown on the right. Select ErrElemMissingSection and toggle on Highlight items in viewport to see the elements with the error. (You can perform Boolean on the viewport contents for better visualization using the buttons on the bottom)