Object declaration error [closed] - c++

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I have a very strange issue when creating an object of the class "CorrelatedNormalGenerator". Please see code below. The class Matrix is used by the class CorrelatedNormalGenerator. Thanks in advance for your help.
in Matrix.h
#include <string>
#include <vector>
using namespace std;
template <typename T, typename I>
class Matrix
{
private:
vector<vector<T> > M;
I minRowIndex, maxRowIndex;
I minColIndex, maxColIndex;
I rowNumber, colNumber;
public:
Matrix(); // default constructor
Matrix(const I& _rowNumber,
const I& _colNumber,
const T& value = 0.0,
const I& _minRowIndex = 0,
const I& _minColIndex = 0);
Matrix<T,I>& operator = (const Matrix<T,I>& N);
Matrix(const Matrix<T,I>& N); // copy constructor,
virtual ~Matrix(){};
T& operator() (const I& row, const I& col);
const T& operator() (const I& row, const I& col) const;
};
template<typename T, typename I>
Matrix<T,I> :: Matrix(const Matrix<T,I>& N)
{
M = N.M;
rowNumber = N.GetRows();
colNumber = N.GetCols();
minRowIndex = N.minRowIndex;
minColIndex = N.minColIndex;
maxRowIndex = N.minRowIndex + N.rowNumber - 1;
maxColIndex = N.minColIndex + N.colNumber - 1;
}
template<typename T, typename I>
Matrix<T,I> :: Matrix( const I& _rowNumber,
const I& _colNumber,
const T& value,
const I& _minRowIndex,
const I& _minColIndex)
{
minRowIndex = _minRowIndex;
minColIndex = _minColIndex;
maxRowIndex = _minRowIndex + _rowNumber - 1;
maxColIndex = _minColIndex + _colNumber - 1;
rowNumber = _rowNumber;
colNumber = _colNumber;
M.resize(rowNumber);
for (I i = minRowIndex ; i < rowNumber; i++)
M[i].resize(colNumber, value);
}
template<typename T, typename I>
T& Matrix<T,I> :: operator() (const I& row, const I& col)
{
return M[row][col];
}
// Access the individual elements (const)
template<typename T, typename I>
const T& Matrix<T,I> :: operator() (const I& row, const I& col) const
{
return M[row][col];
}
template<typename T, typename I>
Matrix<T,I>& Matrix<T,I> :: operator = (const Matrix<T,I>& N)
{
rowNumber = N.GetRows();
colNumber = N.GetCols();
minRowIndex = N.minRowIndex;
minColIndex = N.minColIndex;
maxRowIndex = N.minRowIndex + N.rowNumber - 1;
maxColIndex = N.minColIndex + N.colNumber - 1;
M.resize(rowNumber);
I i,j;
for (i= minRowIndex; i <= maxRowIndex; i++)
{
M[i].resize(colNumber);
}
for (i= minRowIndex; i <= maxRowIndex; i++)
{
for (j = minColIndex; j <= maxColIndex; j++)
{
M[i][j] = N(i,j);
}
}
return *this;
}
in CorrelatedNormalGenerator.h
#include "Matrix.h"
#include <cmath>
using namespace std;
template <typename T, typename I> // I = paramanter of matrix
class CorrelatedNormalGenerator
{
private:
Matrix <T,I> SIGMA; // covariance matrix
public:
CorrelatedNormalGenerator(Matrix <T,I>& _SIGMA);
vector <T> GetCorrVectorSingleAsset(const vector<T>& uncorrVector1,
const vector<T>& uncorrVector2);
vector <T> GetCorrVectorMultiAsset(const vector<T>& uncorrVector);
virtual ~CorrelatedNormalGenerator(){};
};
template <typename T, typename I>
CorrelatedNormalGenerator<T,I> :: CorrelatedNormalGenerator(Matrix <T,I>& _SIGMA)
{
SIGMA =_SIGMA;
}
template <typename T, typename I>
vector <T> CorrelatedNormalGenerator<T,I> :: GetCorrVectorMultiAsset(const vector<T>& uncorrVector)
{
Matrix<T,I> Chol = SIGMA.Cholesky();
return Chol*uncorrVector;
}
template <typename T, typename I>
vector <T> CorrelatedNormalGenerator<T,I> :: GetCorrVectorSingleAsset(const vector<T>& uncorrVector1, const vector<T>& uncorrVector2)
{
vector<T> corrVector(uncorrVector1.size());
for (unsigned i = 0; i < uncorrVector1.size(); i++)
corrVector[i] = rho*uncorrVector1[i] + sqrt(1- rho*rho)*uncorrVector2[i];
return corrVector;
}
in MAIN.cpp
#include "CorrelatedNormalGenerator.h"
using namespace std;
int main()
{
Matrix<double, int> P (3,3,0.0);
P(0,0) = 1.0;
P(1,1) = 1.0;
P(2,2) = 1.0;
P(1,2) = P(2,1) = 0.5;
P(0,1) = P(1,0) = 0.6;
P(0,2) = P(2,0) = 0.3;
CorrelatedNormalGenerator<double, int> gen(P); // ERROR: MAIN.cpp MAIN.obj : error LNK2019: unresolved external symbol "public: __thiscall Matrix<double,int>::Matrix<double,int>(void)" (??0?$Matrix#NH##QAE#XZ) referenced in function "public: __thiscall CorrelatedNormalGenerator<double,int>::CorrelatedNormalGenerator<double,int>(class Matrix<double,int> &)" (??0?$CorrelatedNormalGenerator#NH##QAE#AAV?$Matrix#NH###Z)
return 0;
}

Answer 1

It is telling you that you did not implement the Matrix default constructor, and I don't see it in the code you posted. Add the code for
Matrix<T,I>::Matrix<T,I>()
It is needed because you define a matrix in CorrelatedNormalGenerator without initializing it in an initializer list using one of the other Matrix ctors, hence the need for default ctor :
private:
Matrix <T,I> SIGMA; // covariance matrix