fixed! now i have this

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  8
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
Build  : 8-1c9b5879390b
Exec   : checkMesh
Date   : Feb 28 2026
Time   : 16:44:49
Host   : "UwU"
PID    : 6682
I/O    : uncollated
Case   : /root/VKI_ASSIGNMENT
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create polyMesh for time = 0

Time = 0

Mesh stats
    points:           45757
    internal points:  1
    faces:            89717
    internal faces:   43963
    cells:            22280
    faces per cell:   6
    boundary patches: 1
    point zones:      0
    face zones:       1
    cell zones:       1

Overall number of cells of each type:
    hexahedra:     22280
    prisms:        0
    wedges:        0
    pyramids:      0
    tet wedges:    0
    tetrahedra:    0
    polyhedra:     0

Checking topology...
    Boundary definition OK.
    Cell to face addressing OK.
 ***Unused points found in the mesh, number unused by faces: 1 number unused by cells: 1
  <<Writing 1 unused points to set unusedPoints
    Upper triangular ordering OK.
    Face vertices OK.
    Number of regions: 1 (OK).

Checking patch topology for multiply connected surfaces...
    Patch               Faces    Points   Surface topology
    patch0              45754    45756    ok (closed singly connected)

Checking geometry...
    Overall domain bounding box (0 -0.0129 0) (0.1629 0.15 0.001)
    Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
    Mesh has 3 solution (non-empty) directions (1 1 1)
    Boundary openness (-1.631775608e-18 -1.087850405e-18 3.966121269e-19) OK.
    Max cell openness = 2.420022005e-16 OK.
    Max aspect ratio = 3.188482945 OK.
    Minimum face area = 2.013486826e-07. Maximum face area = 6.45e-07.  Face area magnitudes OK.
    Min volume = 2.013486826e-10. Max volume = 3.225e-10.  Total volume = 6.70177012e-06.  Cell volumes OK.
    Mesh non-orthogonality Max: 29.48815932 average: 3.323283457
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 0.5498037735 OK.
    Coupled point location match (average 0) OK.

Failed 1 mesh checks.

everything seems to be okay, but it also says "Failed 1 mesh checks.", what should i fix there? :/