This might be a problem arising because of version issues. I downloaded the Zip files and executed the steps on OpenFoam 4.1. surfaceFeatureExtract command is getting executed correctly.

I would suggest you to add arguments to the command, like
"surfaceFeatureExtract  -includedAngle 100 constant/triSurface/flange.stl" (i.e. your .stl filepath)

Hope this helps.

Hi Mr Aashay thanks you, i downloaded the zip file too, but im using the OF 2.1 as in the tutorial video, but at this time the error differ from the past one, ill attach you it. Note the last line between this  message and the last one.

Usage: surfaceFeatureExtract [OPTIONS] <surface> <output set>
options:
  -case <dir>       specify alternate case directory, default is the cwd
  -closeness <scalar>
                    span to look for surface closeness
  -deleteBox <((x0 y0 z0)(x1 y1 z1))>
                    remove edges within specified bounding box
  -featureProximity <scalar>
                    distance to look for close features
  -includedAngle <degrees>
                    construct feature set from included angle [0..180]
  -manifoldEdgesOnly
                    remove any non-manifold (open or more than two connected
                    faces) edges
  -minElem <int>    remove features with fewer than the specified number of
                    edges
  -minLen <scalar>  remove features shorter than the specified cumulative length

  -noFunctionObjects
                    do not execute functionObjects
  -set <name>       use existing feature set from file
  -subsetBox <((x0 y0 z0)(x1 y1 z1))>
                    remove edges outside specified bounding box
  -writeObj         write extendedFeatureEdgeMesh obj files
  -writeVTK         write extendedFeatureEdgeMesh vtk files
  -srcDoc           display source code in browser
  -doc              display application documentation in browser
  -help             print the usage

extract and write surface features to file

Using: OpenFOAM-2.1 (see www.OpenFOAM.org)
Build: 2.1-88b2f2ae3a0b



--> FOAM FATAL ERROR:
Wrong number of arguments, expected 2 found 5


FOAM exiting

thanks for help me, the last problem was solved using "surfaceFeatureExtract -includedAngle 150 -writeObj constant/triSurface/flange.stl flange_1" but i got a new error

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0

Read mesh in = 1.234 s

Overall mesh bounding box  : (-0.03 -0.03 -0.03) (0.03 0.03 0.01)
Relative tolerance         : 1e-006
Absolute matching distance : 9.38083e-008

Reading refinement surfaces.
Read refinement surfaces in = 0.204 s

Reading refinement shells.
Refinement level 3 for all cells inside refineHole
Read refinement shells in = 0 s

Setting refinement level of surface to be consistent with shells.
Checked shell refinement in = 0.125 s

Reading features.
Refinement level 0 for all cells crossed by feature "flange.eMesh" (767 points,
776 edges).
Detected 18 featurePoints out of 767 on feature flange.eMesh
Read features in = 0.031 s


Determining initial surface intersections
-----------------------------------------



--> FOAM FATAL ERROR:
Number of cells in mesh:8000 does not equal size of cellLevel:35656
This might be because of a restart with inconsistent cellLevel.

    From function hexRef8::getLevel0EdgeLength() const
    in file polyTopoChange/polyTopoChange/hexRef8.C at line 357.

FOAM aborting

Can you help me!