3d mesh problem

Hi all,

I am running 3d simulation of static mixer (72x72x250). Simulation is running successfully. When I open .vti files in paraview and try to run “stream tracer” I am getting the following error:

[center]Generic Warning: In …\ParaView3\VTK\Filtering\vtkPolyLine.cxx, line 194
Coincident points in polyline…can’t compute normals

Can anybody explain to me the meaning of the error message?

I assume there may be a problem with a mesh I have created. Is there some tool that can check mesh?