System.Extensions Class

After upgrading from 2018.x.x version to 2019.x.x, I’m getting Arguments Exception with stringVariable.IsNullOrEmpty, I can resolve it by using proper String.IsNullOrEmpty(stringVariable) but I observed that the class System.Extensions is no longer accessible.
The System.Extensions seems to be a uipath internal class not sure which library/package it is included in.
Can someone verify that new versions like 2019.x.x don’t support System.Extensions or any Nupkg needs to be added for it?

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