What is this tuple assignment error?

function SVDRLS
  annotation(Diagram(coordinateSystem(extent={{-148.5,-105.0},{148.5,105.0}}, preserveAspectRatio=true, initialScale=0.1, grid={5,5})));
import Modelica.Math.Matrices;
  input Real A[3,2];
  output Real sigmasvd[3,2];
  output Real Usvd[3,3];
  output Real VTsvd[2,2];

algorithm
(sigmasvd,Usvd,VTsvd):=Matrices.singularValues(A);

end SVDRLS;

[<interactive>:10:1-10:50:writable] Error: Type mismatch in assignment in (sigmasvd,Usvd,VTsvd) := Modelica.Math.Matrices.singularValues({{A[1,1],A[1,2]},{A[2,1],A[2,2]},{A[3,1],A[3,2]}}) of (Real[3, 2], Real[3, 3], Real[2, 2]) := (Real[:], Real[:, :], Real[:, :])
[<interactive>:10:1-10:50:writable] Error: Tuple assignment only allowed when rhs is function call (in Modelica.Math.Matrices.singularValues({{A[1,1],A[1,2]},{A[2,1],A[2,2]},{A[3,1],A[3,2]}}))