streamlines tracing

Hi, i’am new in Paraview. I’m trying to visualise the streamlines of a velocity field. The file that i have is a .vtp file (the . vtp is a solution of CFD simulation, obtained with SimVascular). I’m trying, for doing that, to use the filter “streamtracer”. But i didn’t succeded. I don’t understand what the problem is.
SOLUTION_FILE (2).zip (1.8 MB)

Your data does not contain the field, only the surface, you cannot trace streamlines with that.

thanks a lot. i have understood the problem. i was totally wrong. Now i succeded in tracking the streamlines.