Segmentation fault; Core dumped error in during calculations

 When you are running DFT or other calculations, you may have faced errors like this.

Segmentation fault; Core dumped.

These errors occur due to memory issues. 

When you run the calculation, you are trying to access memory which you do not have access. 

Go through this Wikipedia page.

You may also go through this page.

https://stackoverflow.com/questions/19641597/what-is-segmentation-fault-core-dumped