Error: Cannot create unknown type, {https://schemas.uipath.com/workflow/activities}SendOutlookMail

[Palaniyappan (Forum Leader)]

Buddy hope this would help you

Message: Cannot create unknown type

Good day I am getting the following error when I try to run my workflow Message: Cannot create unknown type ‘{http://schemas.microsoft.com/netfx/2009/xaml/activities}Variable({http://schemas.uipath.com/workflow/activities}DatabaseConnection)’. Source: System.Xaml Exception Type: XamlObjectWriterException This occurs when trying to create and run a Database connection, when creating the connection the test connection is successful. Any help would be appreciated Massimo

As you say you were able to find all the activities available, I would like to suggest you one more thing update all the packages in UiPath studio, close the studio and open studio, now check buddy…
@jingwang0222

cheers…!