[Amirthaa]

I've been working on the WindAroundBuildings tutorial and have been trying to just replace the geometry for start. I have replaced the original geometry with a .stl file. Now, when I run the snappyHexMesh, I get the following warning:

Reading refinement surfaces...
--> FOAM Warning :
From function Foam::refinementSurfaces::refinementSurfaces(const Foam::searchableSurfaces&, const Foam::dictionary&, Foam::label)
in file refinementSurfaces/refinementSurfaces.C at line 215
Reading "/home/amirthaa/OpenFOAM/amirthaa-10/run/WABEx2/system/snappyHexMeshDict/castellatedMeshControls/refinementSurfaces" from line 49 to line 50
Not all entries in refinementSurfaces dictionary were used. The following entries were not used : 1(av1)

My snappyHexMeshDict code:

/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 10
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
object snappyHexMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#includeEtc "caseDicts/mesh/generation/snappyHexMeshDict.cfg"

castellatedMesh on;
snap on;
addLayers off;

geometry
{
av1.stl
{
type triSurfaceMesh;
file "av1.obj";
}

refinementBox
{
type searchableBox;
min ( 0 0 0);
max (250 180 90);
}
};

castellatedMeshControls
{
features
(
{ file "av1.obj"; level 1; }
);

refinementSurfaces
{
av1
{
level (3 3);
patchInfo { type wall; }
}
}

refinementRegions
{
refinementBox
{
mode inside;
level 2;
}
}

insidePoint (1 1 1);
}

snapControls
{
explicitFeatureSnap true;
implicitFeatureSnap false;
}

addLayersControls
{
layers
{
stlSurface
{
nSurfaceLayers 2;
}
}

relativeSizes true;
expansionRatio 1.2;
finalLayerThickness 0.5;
minThickness 1e-3;
}

meshQualityControls
{}

writeFlags
(
// scalarLevels
// layerSets
// layerFields
);

mergeTolerance 1e-6;

// ************************************************** *********************** //

It would be useful if someone can guide me on the cause of this warning.