Cron Expression Descriptor error


I’m trying to use the cron expression descriptor library in my project:

This library is available through Packages store and, as I understand, used also by UiPath itself for Orchestrator.

But I have some issues using this library in my project. I need simple Assign from cron string to decription string, for which I’m using simple syntax:
str_scheduleDescription = CronExpressionDescriptor.ExpressionDescriptor.GetDescription(cron)

This works with the library version 1.21.2 or lower.

When I try any higher version, UiPath returns this error:
Reference required to assembly ‘netstandard, Version=, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51’ containing the base class ‘System.Object’. Add one to your project.

Any idea how to solve this?