iPart Template not working for me

Hello, I'd like to develop and debug complex iParts using Visual Studio.

I'm following the guidelines from https://developer.imis.com/v1.0.1/docs/developing-webform-based-iparts-ascx, but I'm stuck in the part after I create a new project from the Template I downloaded from www.advsol.com/ASI/DeveloperResources

When I try to compile the just created project, it fails with many erros like 'iPart4Common.cs(4,11,4,19): error CS0234: The type or namespace name 'Business' does not exist in the namespace 'Asi' (are you missing an assembly reference?)'

I've checked and saw that the references are there.

Can anyone help me get started with complex iParts ?

Thank you