I attempted to use this extension several times today for creating custom activity. However, every time I create a new project, input the required arguments in the newly created activity , and include some concatenation code in the activity file, the designer.xaml file consistently displays errors that are difficult to understand . Initially, I considered the possibility that the issue might be related to my custom icon for the activity. However, even after 7-8 attempts using the default icon, the error persists. Kindly refer to this previous question I have posted for more details on this matter.
EDIT:- Even this guys from UiPath i guess have faced the same error when opend the Designer.xaml file , But when they published the pakage it got published even though there was errors in designer.xaml file