Custom class import probplem

Hello everyone!

I wrote a simple class library .Net Standard and imported it as nuget in UiPath. Added dependencies, imported the namespace. As a result, my public classes are simply not visible, Although I have tested the code on other projects in Visual Studio.

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As a result, I tried to register a class and got a message:
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It says here: compiler errors were Detected when processing the expression " GetAddress.City". A reference to the “netstandard …” Assembly containing the “System.Object” base class is required. Add this link to the project.

Does this mean that class libraries .Net Standard can’t be used in UiPath?
Thank you.