When starting the elastic analysis of a model with a dynamic load, the error below appears:

## Solution 1

- Verify the stiffness properties of the elements: check if the sections and material properties are well defined. If an element has no stiffness, it shouldn’t be modelled in Diamonds.

## Solution 2

This error cal also be caused by a malfunction in the load groups.

- Remove all load groups besides
*Self-weight*and*Seismic*. - Regenerate the combinations and calculate the structure using only those two load groups.
- If this calculates, define the load groups again one by one. Regenerate the combinations and calculate the structure between each addition.