This can arise if you put the mesh file after the session file in the command line. Possibly this is what you are doing. Try reversing the order of these files. We are proposing to remove the definition of Expansion from the mesh file to stop this happening. Cheers, Spencer. From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of ztdepyahoo <ztdepyahoo@gmail.com> Date: Wednesday, 24 February 2021 at 00:08 To: nektar-users <nektar-users@imperial.ac.uk> Subject: [Nektar-users] Warning: Level 0 assertion violation Using Default variable expansion definition for field: u This email from ztdepyahoo@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. when i run incsolver, i got the following error. Could you please help me out. INCSOLVER...................... Warning: Level 0 assertion violation Using Default variable expansion definition for field: u Warning: Level 0 assertion violation Using Default variable expansion definition for field: v Warning: Level 0 assertion violation Using Default variable expansion definition for field: w Warning: Level 0 assertion violation Using Default variable expansion definition for field: p [https://mail-online.nosdn.127.net/smac21b248a56949de9f08898ddfa22c2b.jpg] ztdepyahoo ztdepyahoo@gmail.com 签名由 网易邮箱大师<https://mail.163.com/dashi/dlpro.html?from=mail81> 定制