Alglib when using "spline1dbuildlinear" getting exception in block catch (alglib_impl :: ae_error_type)

I started using the Alglib library specifically for the spline1dbuildlinear function.

When using a small dataset (for X and Y), like the script code below, it works fine:

vector<double> X(5), Y(5);
X[0]=0.1;
X[1]=0.4;
X[2]=1.2;
X[3]=1.8;
X[4]=2.0;
Y[0]=0.1;
Y[1]=0.7;
Y[2]=0.6;
Y[3]=1.1;
Y[4]=0.9;
AX.setcontent(X.size(), &(X[0]));
AY.setcontent(Y.size(), &(Y[0]));
alglib::spline1dinterpolant spline;
alglib::spline1dbuildlinear(AX, AY, X.size(), spline);

      

        
        
        
      

    

But when using X and Y, the vector contains double elements whose size is "1995" and it throws an exception into the block lock (alglib_impl :: ae_error_type).

After trying to find any solution over the internet, I found that I might need to use:

alglib_impl::ae_state *_state;

      

        
        
        
      

    

state initialization function but couldn't find the correct way to debug. Any suggestions would be much appreciated.