How to run the DWSIM.Thermodynamics.StandaloneLibrary project Example1.vb

[alkanism]

DWSIM.Thermodynamics.StandaloneLibrary.dll exists as a reference in the subject project, but I get
Type 'DWSIM.Thermodynamics.CalculatorInterface.Calculator' is not defined error on the line:
Dim dtlc As New DWSIM.Thermodynamics.CalculatorInterface.Calculator.

Following imports don't seem to work:
Imports DWSIM.Thermodynamics.BaseClasses
Imports DWSIM.Thermodynamics.PropertyPackages

I get several other type is not defined errors in the same vb file as well, such as:
Dim prpp As New NRTLPropertyPackage(True)

Can someone tell me what I'm doing wrong?

I am using v9.0.4
I built the solution under VS2019 and using Debug/x64 and it was successful without errors.
I did not change anything in DWSIM solution; using everything as-is