failed 1 mesh checks
 

Hello,
I am trying to create a cylinder with a cylindrical wall inside it. i wrote a blockMeshDict file and all the things are true, except when i checkMesh that, there is a problem with inlet boundary and it fails to check inlet boundary. does anybody know what the problem is?
thank you so much.

the blockMeshDict file is here:

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.1.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
/*AxiSymmetric mesh!

x =R*cos (theta/2)
y =R*sin (theta/2) theta = angle!!!!!!!!

theta= 5 degree */
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
convertToMeters 0.001;

vertices
(
(0 0 0) //0
(0.0026172 0.05994 0)//1
(0.0026172 0.05994 30)//2
(0 0 30)//3
(-0.0026172 0.05994 0)//4
(-0.0026172 0.05994 30)//5
(0.0098145 0.224775 0)//6
(-0.0098145 0.224775 0)//7
(0.0098145 0.224775 28.5)//8
(-0.0098145 0.224775 28.5)//9
(-0.0026172 0.05994 28.5) //10
(0.0026172 0.05994 28.5) //11
(0.4362 9.99 0) //12
(-0.4362 9.99 0) //13
(0.4362 9.99 30) //14
(-0.4362 9.99 30)//15
(-0.0098145 0.224775 30)//16
(0.0098145 0.224775 30)//17
);

blocks
(
hex (0 1 4 0 3 2 5 3) (40 1 40) simpleGrading (1 1 1)//element0
hex (1 6 7 4 11 8 9 10) (40 1 40) simleGrading (1 1 1)//element1
hex (6 12 13 7 17 14 15 16) (40 1 40) simpleGrading (1 1 1)//element2
);

edges
(
);

boundary
(
front
{
type wedge;
faces
(
(0 1 2 3)
(1 6 8 11)
(6 12 14 17)
);
}

back
{
type wedge;
faces
(
(0 4 5 3)
(4 7 9 10)
(7 13 15 16)
);
}

fixedWall
{
type wall;
faces
(
(13 12 14 15)
);

}

walls
{
type wall;
faces
(
(10 11 2 5)
(10 11 8 9)
(9 8 17 16)
)
}

inlet
{
type patch;
faces
(
(3 2 5 3)
);
}

outlet
{
type patch;
faces
(
(0 1 4 0)
);
}

axis
{
type empty;
faces
(
(0 3 3 0)
);
}
);

mergePatchPairs
(
);

///////////////////////////////////