******************* This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address. ******************* Dear all, This is Silvia Ceccacci from Macquarie University, Sydney. I am a new PhD student in Mathematics and I have just started to use Nektar++ to perform 3D incompressible N-S simulations. I am exporting a mesh from gmsh and I am trying to simulate a flow around a sphere. So I would like to generate the 3D mesh within the main domain with the sphere taken out (see sphere_2.geo). I managed to generate the .msh file (see sphere_2.msh), using the command line gmsh -3 -order 3 sphere_2.geo but now I get an error (see error.png) when I issue NekMesh sphere_2.msh sphere_2.xml I am not sure what the error means and/or what am I doing wrong? Could you help me with this, please? Any little help or suggestion would be greatly appreciated. Thank you in advance. Kind regards, Silvia