> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Lattice Error

## Only cubic unit cells are currently supported

### About the error

**Issue:**
The unit cell imported wasn’t cubic.

**Applies to:**

* Import Element Pro Rule

**Cause:**

* An imported unit cell that isn’t cubic.

**Solution:**

* Edit the unit cell in Element Pro to create a cubic unit cell.

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## Lattice rule is incompatible with mesh tessellation

### About the error

**Issue:**
The polyhedron built from the face is inconsistent with the lattice rule.

**Applies to:**

* Import Element Pro Rule

**Cause:**

* The unit cell of the surface lattice rule cannot map to one or more faces on the mesh.

**Solution:**

* If the lattice rule uses cubic unit cells, quadrangulate the mesh before generating the surface lattice.
* Update the lattice rule to a cubic unit cell or a different one in case the lattice rule is custom or polyhedron type, as we can't use it to generate a surface lattice.

***