Problem with snappyHexMesh command
 

Hi everyone
When i wanted to launch snappyHexMesh by the command
snappyHexMesh -overwrite
I see this error message :

Usage: snappyHexMesh [OPTIONS]
options:
-case <dir> specify alternate case directory, default is the cwd
-checkGeometry check all surface geometry for quality
-dict <file> read control dictionary from specified location
-noFunctionObjects
do not execute functionObjects
-outFile <fileName>
name of the file to save the simplified surface to
-overwrite overwrite existing mesh/results files
-parallel run in parallel
-patches <(patch0 .. patchN)>
only triangulate selected patches (wildcards supported)
-roots <(dir1 .. dirN)>
slave root directories for distributed running
-surfaceSimplify <boundBox>
simplify the surface using snappyHexMesh starting from a
boundBox
-srcDoc display source code in browser
-doc display application documentation in browser
-help print the usage

Using: OpenFOAM-2.3.0 (see www.OpenFOAM.org)
Build: 2.3.0-f5222ca19ce6



--> FOAM FATAL ERROR:
Wrong number of arguments, expected 0 found 1


FOAM exiting

I don't understand what i have to do. Moreover when i did it in the morning it has worked well.