How to merge faces in open cascade so that the faces are meshed together

I'm attempting to use this Algoritm however it breaks my codebase, here is a minimal reproduceable example of how i have used it:
```
#include <iostream>
#include <fstream>
#include <ShapeUpgrade_UnifySameDomain.hxx>
#include <STEPControl_Reader.hxx>
#include <STEPControl_Writer.hxx>
#include <TopoDS.hxx>

int main()
{
const char* inputPath = "ball-valve.step";
const char* outputPath = "output.step";

// Initialize the STEP reader
STEPControl_Reader reader;
if (reader.ReadFile(inputPath) != IFSelect_RetDone)
{
std::cout << "Error: cannot read file." << std::endl;
return 1;
}

// Check the load status
reader.PrintCheckLoad(true, IFSelect_ItemsByEntity);
if (reader.TransferRoots() != reader.NbRootsForTransfer())
{
std::cout << "Error: roots transferred unsuccessfully." << std::endl;
return 1;
}

// Get the shape from the reader
TopoDS_Shape shape = reader.Shape();

// Perform "unify domains" algorithm
ShapeUpgrade_UnifySameDomain unifyDomains(shape);
unifyDomains.Build();
TopoDS_Shape unifiedShape = unifyDomains.Shape();

// Write the unified shape to STEP file
STEPControl_Writer writer;
writer.Transfer(unifiedShape, STEPControl_AsIs);
if (!writer.Write(outputPath))
{
std::cout << "Error: failed to write output file." << std::endl;
return 1;
}

return 0;
}
```
I am getting error at unifyDomains.Build()
```
Exception thrown at 0x00007FFAA0BFE468 (TKG2d.dll) in quad-remeshing-algorithm.exe: 0xC0000005: Access violation reading location 0x0000000000000000.
```
are there any examples to see how I should use the function