Cannot build a shared class lib package with cTrader.Automate package. Error "Assembly must contain algo type"

Dear all,

I need some support for adding a shared project to my Robots.

I have created a new c# "Utils" class library project and added some class files for technical analysis. As those classes make references to cTrader.API, I added the Nuget package (dotnet add Utils.csproj package cTrader.Automate). If I now want to build my project I always get the error message that "Assembly must contain algo type".

Any idea what I am doing wrong?

Thanks in advance