I faced two troubles, and the root looks same issue.
UiPath Studio 18.3.2(CE) doesn’t add .NET Framework assembly reference.
For example;
Making variable as “System.Windows.Forms.OpenFileDialog” type, we need to refer System.Windows.dll And System.Windows.Forms.dll, but UiPath Studio doesn’t works.
As workaround, We can edit xaml file and add <AssemblyReference> tag directly, but it’s not cool.
Another case,
DataRow[].CopyToDataTable()
Using this method, we need to add assembly “System.Data.DataSetExtensions.dll”, but UiPath Studio doesn’t works.
I tried to add reference from “Imports” pane, but it didn’t work.
I hope this issue will be fixed.
This occured in my environment:
Windows 10 Pro (x64) ver 1803
UiPath 18.3.2(CE) Stable
Activity Versions are;