Subtracting 2 surface vectors and plotting the difference contour

Hi all,
I have tried this: subtracting 2 slices but not able to color it by the difference. I have 2 surface vectors and i have used resampled data set to create a new. Now i am applying the calculator to subtract the quantity sqrt(U_YU_Y+U_ZU_Z)_SurfaceVectors1-sqrt(U_YU_Y+U_ZU_Z)_SurfaceVectors2. But this is not happening and causing some issue. Shall i have to do something else? I have attached the ss where u can see the pipeline at the left.

Thanks!

I have attached the state file here…i want to subtract sqrt(U_Y*U_Y) from surface vectors 2 and the resampled data set and plot the difference.
paraview_support.pvsm (2.2 MB)