[oopsi]

hi,
I am trying to write U components of all cells on a given cuttingPlane. Apparently there are a few compilation errors. Any help would be greatly appreciated.
Heres the code snippet I used:

#   include "setRootCase.H"
#   include "createTime.H"
    instantList timeDirs = timeSelector::select0(runTime, args);
#   include "createMesh.H"
    runTime.setTime(timeDirs[0], 0);
        IOobject Uheader
        (
            "U",
            runTime.timeName(),
            mesh,
            IOobject::MUST_READ
        );
        if (Uheader.headerOk())
        {
            mesh.readUpdate();
            Info<< "    Reading U" << endl;
            volVectorField U(Uheader, mesh);
            
    Info<< "    Calculating mass flux" << endl;
        point xyz(0,0,1);                
    vector dir(0,0,1);                 
    plane plane1(xyz,dir);
    Foam::cuttingPlane cutPlane(plane1, mesh, true);
    const labelList& planeCell = cutPlane.cutCells();
    forAll(planeCell, cellI)
    {
        Info<<"\n"<<mesh.C()[cellI]<<"\t"<<U[cellI].component(0);
    }
    }