[maysmech]

Hi FOAMers;
i want solve lid driven cavity with LES. i used files in tutorial file pisoFoam/LES/.
After creating cavity mesh and adjusting boundary conditions in 0 and polymesh folders and typing pisoFoam leads to:

Create time

Create mesh for time = 0

Reading field p

Reading field U

Reading/calculating face flux field phi



--> FOAM FATAL IO ERROR: 
Unable to set reference cell for field p
    Please supply either pRefCell or pRefPoint


file: /home/maysam/OpenFOAM/maysam-1.7.0/cavityRatio/10000LES/system/fvSolution::PISO from line 71 to line 72.

    From function void Foam::setRefCell
(
    const volScalarField&,
    const volScalarField&,
    const dictionary&,
    label& scalar&,
    bool
)
    in file cfdTools/general/findRefCell/findRefCell.C at line 115.

FOAM exiting

Please help me to find the problem solution.

Best,
Maysam