how to delete the disk in simplewindfoam
 

http://images.star.mop.com/yinghua/2...1215144103.jpg,everyone,i am a new user of openfoam,i want to delete the disk in simplewindfoam,i see some answers and i try to switch on to off in the sourceproperties,and delete the snappyhexmeshdict,but there also has a error:
file: /root/OpenFOAM/root-1.7.1/run/tutorials/incompressible/simpleWindFoam/turbineSiting/constant/polyMesh/sets/actuationDisk1 at line 0.

From function regIOobject::readStream()
in file db/regIOobject/regIOobjectRead.C at line 61.
who can help me , thanks a lot .