HI Kamil, Can you first confirm whether you mesh is now correct? Regards, Spencer. On 8 Nov 2014, at 13:59, Kamil ÖZDEN <kamil.ozden.me@gmail.com<mailto:kamil.ozden.me@gmail.com>> wrote: Dear All, When I try to run an analysis by requesting a History File, Nektar++ 4.0 tells me that: History point 0,0,0 cannot be found in the mesh. but in the .xml file 0, 0, 0 point exists as vertex as you see below: <V ID="9761">0.00000000e+00 0.00000000e+00 0.00000000e+00</V> When I remove history points part from the .xml file, it runs without problem. What may be the reason for this problem? NOTE: The mesh is composed of both pyrisms and hexahedras. So .xml file includes two composites. Regards, Kamil. _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users Spencer Sherwin McLaren Racing/Royal Academy of Engineering Research Chair, Professor of Computational Fluid Mechanics, Department of Aeronautics, Imperial College London South Kensington Campus London SW7 2AZ s.sherwin@imperial.ac.uk<mailto:s.sherwin@imperial.ac.uk> +44 (0) 20 759 45052