Importing an External Mesh: Negative volume for element XXXXX type C3D4

[Ssachd-1]

I'm attempting to import a 3D Tetrahedral Mesh (.vtu) and use it for a single-phase flow simulation. I've successfully simulated using an internal mesh and a provided sample (egg.vtu) without encountering any errors. However, when I import my own mesh, I encounter the following error:

***** ERROR
***** LOCATION: /home/sachdeva/GEOS/codes/GEOS/src/coreComponents/mesh/CellElementSubRegion.cpp:397
***** Controlling expression (should be false): m_elementVolume[k] <= 0.0 ***** Rank 0: Negative volume for element 6020549 type C3D4 in subregion domain/MeshBodies/carteisanMesh/meshLevels/Level0/ElementRegions/elementRegionsGroup/reservoir(Mesh1_co2Injection.xml,l.56)/elementSubRegions/tetrahedra

I've also tried using mesh_doctor.py to investigate the root cause, and it seems that the volume of each element in my mesh is negative, unlike the sample mesh.

I suspect that the source code doesn't account for irregular tetrahedra, where the centroid lies outside the element, causing the negative volume.

Nevertheless, I'm unable to import my desired reservoir geometry. Could you please provide insights if you've encountered a similar problem, or suggest ideas on how I could tackle this error?