Validation Error - Cannot create unknown type

[HongYee_Gan]

Hi, I have this UiPath studio robot. It was running fine until recently (2024 onwards). There was an error when i try to run directly by clicking the running button.

error:
Inbox_Email_Extraction.xaml: Cannot create unknown type ‘{http://schemas.microsoft.com/netfx/2009/xaml/activities}Variable({clr-namespace:System.Collections.Generic;assembly=System.Private.CoreLib}List({clr-namespace:NewTestRegex;assembly=NewTestRegex.Core}PermitDetails))’.

However, the error did not show up when I run from the main sequence (3 dots), then click ‘continue’ after that.

sorry that I am a new user, unable to show more than 1 image.

Need help me to solve this issue. Many Thanks.

[Yoichi]

Hi,

It seems there is unresolved activity in Inbox_Email_Extraction.xaml.
For now, can you check what activity error caused in Inbox_Email_Extraction.xaml and if there is an erro regarding dependencies in Project panel?

Regards,

[HongYee_Gan]

There is no error on dependencies. All dependencies were up to date. The error came at the start, before running any activity. Its like checking for validation. See image.