RBF interpolation with multiquadric method

[mdsa3d]

I am trying to perform radial basis interpolation with multiquadric method. I have developed the below mentioned example to demonstrate my application of the project.

using ScatteredInterpolation

a = [1.0 1.0 13.41; 2.0 1.0 8.60; 3.0 1.0 5.76; 4.0 1.0 3.58; 5.0 1.0 4.69; 6.0 1.0 3.72; 7.0 1.0 6.32; 8.0 1.0 5.68]
x_train = a[:, 1]
y_train = a[:, 2]
z_train = a[:, 3]
samples = z_train
points = [x_train y_train]'
itp = ScatteredInterpolation.interpolate(Multiquadratic(), points, samples; returnRBFmatrix=true);

#testig the interpolated object
x_test = [1.0; 2.28; 2.28; 2.285; 3.57; 4.85; 6.14; 7.42; 8.71; 10.0]
y_test = [1.0; 1.0; 1.0; 1.0; 1.0; 1.0; 1.0; 1.0; 1.0; 1.0]

points_test = [x_test y_test]'
#predicting or evaluating values
interpolated = ScatteredInterpolation.evaluate(itp, points_test)
println(interpolated)

However, when I execute the script with returnRBFmatrix=true for interpolation application, it returns the following error:

LoadError: MethodError: no method matching evaluate(::Tuple{ScatteredInterpolation.RBFInterpolant{Vector{Float64}, LinearAlgebra.Adjoint{Float64, Matrix{Float64}}, Multiquadratic{Int64}, Euclidean}, Matrix{Float64}}, ::LinearAlgebra.Adjoint{Float64, Matrix{Float64}})
Closest candidates are:
  evaluate(::ScatteredInterpolation.RadialBasisInterpolant, ::AbstractMatrix{var"#s36"} where var"#s36"<:Real) at C:\Users\user\.julia\packages\ScatteredInterpolation\05YPn\src\rbf.jl:270
  evaluate(::ScatteredInterpolation.ShepardInterpolant, ::AbstractMatrix{var"#s36"} where var"#s36"<:Real) at C:\Users\user\.julia\packages\ScatteredInterpolation\05YPn\src\idw.jl:32
  evaluate(::ScatteredInterpolation.NearestNeighborInterpolant, ::AbstractMatrix{var"#s36"} where var"#s36"<:Real) at C:\Users\user\.julia\packages\ScatteredInterpolation\05YPn\src\nearestNeighbor.jl:35

To resolve this, I tried passing the rbfMatrix as a stand alone value but that too returned a not defined constructor error:

ERROR: LoadError: MethodError: no constructors have been defined for ScatteredInterpolation.RadialBasisInterpolant

May I know how can this be resolved? Thanks!!