******************* 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. ******************* Hello, I have been attempting to use the cwipi function to form a coupled process with the nektar++ incompressible navier stokes solver and the acoustic solver however there is a repeated error that states: Fatal : Level 0 assertion violation Need to set up pressure field definition I am unsure what this means and why it is occuring. Any help would be greatly appreciated Kind regards, Dauood Tariq