Hi Dongmyung, Many thanks for your email, the session2d.xml is incomplete and you need to complete the missing information based on the instructions provided in the tutorial, that is the reason it is not working. We provided complete sessions files (session2d-Complete.xml and session3d-Complete.xml) there as well that you can use to see what you are missing or use them directly (you need to change the commands and replace session2d.xml with session2d-Complete.xml) for accessing the complete session files, you can either search their name in the notebook and click on them which will open them for you or on the left pannel of the Jupyter lab, inside the folder "02-incns-solver" look for it, all of the files for the tutorial you mentioned are in that folder and accessible in the Jupyter lab. If you don't see the left panel, on the far left of the screen near the "File" there will be a narrow pannerl with several grey icons listed vertically, the first icon which is a folder icon opens the file location Alternatively you can open a terminal (File->new->terminal) and navigate to that folder but you need to work in the terminal. Note "vim" is not accessible but you have access to "vi" , "vim.tiny" and "nano" are available to access the files content. Cheers, Mohsen ________________________________ From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Dongmyung Suh <dongmyung.suh@gmail.com> Sent: Thursday, March 3, 2022 2:59 PM To: nektar-users <nektar-users@imperial.ac.uk> Subject: [Nektar-users] Incompressible Navier-Stokes Solver This email from dongmyung.suh@gmail.com 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. Hi All, I am studying Nektar++ by following the tutorial of Incompressible Navier-Stokes Solver in (https://www.nektar.info/notebooks//tutorials/basics-incns-solver/). I wrote the condition file (mysession.xml) following the direction in the website. But it didn't work. I guess that there were some info missing. When I checked session2d.xml<https://www.nektar.info/notebooks//tutorials/basics-incns-solver/session2d.xml> , there was also some error. So I couldn't see the correct working file. How can I get the session file? Please let me know. Thanks, Dongmyung Suh